Here are a few cards that will be in the new set. I pulled all of this from the Rules document found on upperdecks site.
Link: http://entertainment.upperdeck.com/op/vs_rules/mav_faq.aspx
AIDA
Plot Twist
Ongoing
2 Threshold Cost
MAV-069
Rare
Play AIDA only during your recruit step
Squadron Supreme characters you control cannot be the target of effects your opponents control this turn.
Ongoing: At the start of the recovery phase, if you have no cards in hand, turn AIDA face down.
Baltag, Hand of the Conqueror
Character
Kang Council
4 Cost
7 ATK / 7 DEF
Range
MAV-165
Common
Whenever Baltag reinforces a character named Kang, that character has invulnerability while reinforced this attack.
While Baltag is protecting a character named Kang, that character has invulnerability.
Chaos Magic
Plot Twist
2 Threshold Cost
MAV-032
Rare
Change the target of an effect with one target that is targeting an Avengers character you control to another character you control.
Egghead, Elihas Starr
Character
Masters of Evil
3 Cost
5 ATK / 3 DEF
Range
MAV-126
Common
Leader: Characters adjacent to Egghead have the Masters of Evil affiliation.
Pay 1 resource point >>> At the start of the combat phase, characters adjacent to Egghead get +2 DEF this turn. Use this power only once per turn.
Eldritch Power
Plot Twist
1 Threshold Cost
MAV-073
Common
Target Squadron Supreme character you control gets +3 ATK this turn. Whenever that character causes breakthrough to a player this turn, that player gains 3 endurance.
Force Field Belt
Equipment
0 Cost
MAV-193
Common
Transferable (At the start of your formation step, you may transfer this equipment to a character you control.)
Equipped character gets +1 DEF.
Pay up to 2 resource points >>> Put a +1 ATK / +1 DEF counter on equipped character for each point you paid. Use this power only once per turn.
Foxfire, Olivia Underwood
Character
Squadron Supreme
2 Cost
3 ATK / 2 DEF
MAV-050
Uncommon
Activate, discard a card >>> Target player replaces a non"“Team-Up location or non"“Team-Up ongoing plot twist he controls.
Game of the Galax
Plot Twist
2 Threshold Cost
MAV-181
Rare
As an additional cost to play Game of the Galaxy, exhaust a character named Kang you control.
Each player reveals the top four cards of his deck. If one player revealed more cards that share a name than any other player, that player may put one of his revealed cards into his hand. Each player puts his remaining revealed cards on the bottom of his deck.
Hard Sound Construct
Construct
Plot Twist
4 Threshold Cost
MAV-156
Rare
Play Hard Sound Construct only during the build phase.
Put target Masters of Evil character card with cost 2 or less from your KO'd pile into your front row if you do not control a character with the same name as that card. KO that character at the start of the recovery phase this turn.
Hibernaculum
Plot Twist
3 Threshold Cost
MAV-074
Common
As an additional cost to play Hibernaculum, discard a Squadron Supreme character card.
Put the top three cards of your deck into your KO'd pile. You may return a character card from your KO'd pile to your hand.
Hired Hit
Plot Twist
2 Threshold Cost
MAV-218
Rare
Stun a Crime Lords defender you control. If you do, remove all defenders from this attack, and target non-defending character you control becomes the defender this attack.
Karla Sofen ◊ Meteorite, Twin Moonstones
Character
Thunderbolts
8 Cost
23 ATK / 23 DEF
Flight, Range
MAV-101
Rare
Loyalty
While you have 1 or more endurance, your opponents cannot lose the game and you cannot win the game.
Legendary Battles
Plot Twist
2 Threshold Cost
MAV-034
Common
While team attacking this turn, Avengers characters you control get +1 ATK and cannot be stunned.
Marcus Daniels ◊ Blackout, Darkbringer
Character
Masters of Evil
3 Cost
4 ATK / 5 DEF
MAV-135
Common
Reservist, Concealed"”Optional (You may have this character come into play in the hidden area.)
Pay 1 resource point >>> Masters of Evil characters with cost 4 or less you control have reinforcement this turn. Use this power only if Marcus Daniels is visible.
Melissa Gold ◊ Songbird, Heroine Unbound
Character
Thunderbolts
6 Cost
13 ATK / 12 DEF
Flight, Range
MAV-102
Common
Whenever Melissa Gold attacks, you may ready her. If you do, she cannot attack this turn and you cannot use her activated powers this turn.
Might Makes Right
Plot Twist
1 Threshold Cost
MAV-196
Common
As an additional cost to play Might Makes Right, discard a card.
Target attacker you control gets +3 ATK this attack. If you have no cards in hand, that attacker gets an additional +2 ATK this attack.
Monica Rambeau ◊ Captain Marvel, Lady of Light
Character
Avengers
5 Cost
9 ATK / 9 DEF
Flight, Range
MAV-018
Rare
Leader: Pay 3 endurance >>> Ready all team attackers adjacent to Monica Rambeau. Those team attackers cannot cause breakthrough this turn. Use this power only once per turn.
New Identity
Plot Twist
Ongoing
2 Threshold Cost
MAV-117
Rare
Choose a Thunderbolts character you control.
Ongoing: At the start of the recovery phase, put a +1 ATK / +1 DEF counter on the chosen character.
Nighthawk, Kyle Richmond
Character
Squadron Supreme
5 Cost
9 ATK / 9 DEF
MAV-059
Common
Reservist
Leader: Characters adjacent to Nighthawk can attack hidden characters.
Equipped characters adjacent to Nighthawk get +1 ATK / +1 DEF.
Other-Earth
Plot Twist
3 Threshold Cost
MAV-075
Rare
Play Other-Earth only if you control a Squadron Supreme character.
If you played no other plot twists this turn, characters your opponents control lose and cannot gain reinforcement and get -2 DEF while defending this turn.
You cannot play plot twists this turn.
Peace in Our Time
Plot Twist
Ongoing
2 Threshold Cost
MAV-077
Uncommon
Play Peace in Our Time only during the build phase and only if you control a Squadron Supreme character.
Ongoing: At the start of the recovery phase, each player who controls one or more characters that caused breakthrough this turn discards a card.
Polaris, Lorna Dane
Character
X-Men
4 Cost
7 ATK / 7 DEF
Flight, Range
MAV-204
Uncommon
At the start of your attack step, characters your opponents control lose flight and range this turn.
Power Princess, The Last Utopian
Character
Squadron Supreme
7 Cost
16 ATK / 15 DEF
Flight
MAV-060
Rare
Leader: Whenever a character adjacent to Power Princess causes breakthrough, each player loses 2 endurance for each card in his hand.
Power Princess, Zarda
Character
Squadron Supreme
4 Cost
7 ATK / 7 DEF
Flight
MAV-061
Common
If Power Princess would cause breakthrough while attacking a character, instead, a character of your choice gets +3 ATK / +3 DEF this turn.
Project Liberator
Plot Twist
2 Threshold Cost
MAV-118
Rare
Play Project Liberator only during your recruit step.
Characters you control cannot be the target of plot twist or payment effects this turn.
At the start of your recruit step, if Project Liberator is in your KO'd pile, you may discard a Thunderbolts character card. If you do, you may return Project Liberator to your hand.
Project Utopia
Plot Twist
Ongoing
3 Threshold Cost
MAV-078
Rare
Choose a Squadron Supreme character you control.
Ongoing: Whenever the chosen character stuns a defender, that defender's controller loses 4 endurance.
Whenever the chosen character causes breakthrough, KO it.
Quicksilver, Mutant Avenger
Character
Avengers
3 Cost
4 ATK / 5 DEF
MAV-020
Common
Reservist (You may recruit this card from your resource row. If you do, you may put a card from your hand face down into your resource row.)
Whenever a defender becomes stunned by one or more team attackers you control, ready Quicksilver.
Repel Attack
Plot Twist
1 Threshold Cost
MAV-039
Common
Target leader defender you control gets +1 DEF this attack for each non-stunned character adjacent to it. If that defender has the Avengers affiliation, it has reinforcement this attack.
Spider-Man, Peter Parker
Character
Spider-Friends
4 Cost
7 ATK / 7 DEF
MAV-209
Rare
Evasion
Pay 1 endurance >>> Stunned Spider-Friends characters you control cannot be the target of effects your opponents control this turn.
Characters with evasion you control get +1 DEF while attacking and +1 ATK while defending.
Supreme Sanction
Team-Up
Plot Twist
Ongoing
2 Threshold Cost
MAV-189
Common
Play Supreme Sanction only if you control an Avengers character and a Squadron Supreme character.
Ongoing: Characters you control, as well as cards in your hand, deck, and KO'd pile that have either the Avengers or Squadron Supreme affiliation have both affiliations.
Revealed character cards in your resource row have reservist.
System Failure
Plot Twist
2 Threshold Cost
MAV-200
Rar
Remove target attacker from this attack if its ATK is greater than twice its printed ATK.
The Wrecker, Wrecking Crew
Character
Masters of Evil
6 Cost
13 ATK / 12 DEF
MAV-145
Common
Reservist
Other Wrecking Crew characters you control get +1 ATK / +1 DEF.
Pay 1 resource point >>> Wrecking Crew characters you control get +2 ATK and can attack hidden characters this turn. Use this power only once per turn.
The Wrecking Crew
Plot Twist
2 Threshold Cost
MAV-161
Common
Target Masters of Evil attacker you control gets +2 ATK this attack. Non-Army characters you control that share a cost or version with that attacker and are adjacent to it get +2 ATK while attacking this turn.
Thor, Odinson
Character
Avengers
4 Cost
8 ATK / 7 DEF
Flight, Range
MAV-025
Rare
As an additional cost to recruit Thor, reveal an Avengers character card in your hand or resource row.
Whenever Thor causes breakthrough to a player, put the top card of your deck into your KO'd pile. That player loses endurance equal to the cost of that card.
Two Worlds, Team-Up
Plot Twist
Ongoing
2 Threshold Cost
MAV-041
Common
Choose two team affiliations among characters you control. If you chose Avengers and a different affiliation and you control another face-up resource named Two Worlds, draw a card.
Ongoing: Characters you control, as well as cards in your deck, hand, and KO'd pile that have either of the chosen affiliations have both affiliations.
Walk Through Walls
Plot Twist
4 Threshold Cost
MAV-042
Rare
Play Walk Through Walls only during your recruit step.
Discard a card. Move target Avengers character you control to your hidden area. That character cannot be the target of effects your opponents control this turn. At the start of the recovery phase this turn, move that character to your visible area.
Windstorm
Plot Twist
2 Threshold Cost
MAV-203
Common
Target character with cost 2 or greater you control has flight this turn. That character gets +2 ATK while attacking this turn and an additional +2 ATK while attacking this turn if you control another character with the same cost as that character.
Link: http://entertainment.upperdeck.com/op/vs_rules/mav_faq.aspx
AIDA
Plot Twist
Ongoing
2 Threshold Cost
MAV-069
Rare
Play AIDA only during your recruit step
Squadron Supreme characters you control cannot be the target of effects your opponents control this turn.
Ongoing: At the start of the recovery phase, if you have no cards in hand, turn AIDA face down.
Baltag, Hand of the Conqueror
Character
Kang Council
4 Cost
7 ATK / 7 DEF
Range
MAV-165
Common
Whenever Baltag reinforces a character named Kang, that character has invulnerability while reinforced this attack.
While Baltag is protecting a character named Kang, that character has invulnerability.
Chaos Magic
Plot Twist
2 Threshold Cost
MAV-032
Rare
Change the target of an effect with one target that is targeting an Avengers character you control to another character you control.
Egghead, Elihas Starr
Character
Masters of Evil
3 Cost
5 ATK / 3 DEF
Range
MAV-126
Common
Leader: Characters adjacent to Egghead have the Masters of Evil affiliation.
Pay 1 resource point >>> At the start of the combat phase, characters adjacent to Egghead get +2 DEF this turn. Use this power only once per turn.
Eldritch Power
Plot Twist
1 Threshold Cost
MAV-073
Common
Target Squadron Supreme character you control gets +3 ATK this turn. Whenever that character causes breakthrough to a player this turn, that player gains 3 endurance.
Force Field Belt
Equipment
0 Cost
MAV-193
Common
Transferable (At the start of your formation step, you may transfer this equipment to a character you control.)
Equipped character gets +1 DEF.
Pay up to 2 resource points >>> Put a +1 ATK / +1 DEF counter on equipped character for each point you paid. Use this power only once per turn.
Foxfire, Olivia Underwood
Character
Squadron Supreme
2 Cost
3 ATK / 2 DEF
MAV-050
Uncommon
Activate, discard a card >>> Target player replaces a non"“Team-Up location or non"“Team-Up ongoing plot twist he controls.
Game of the Galax
Plot Twist
2 Threshold Cost
MAV-181
Rare
As an additional cost to play Game of the Galaxy, exhaust a character named Kang you control.
Each player reveals the top four cards of his deck. If one player revealed more cards that share a name than any other player, that player may put one of his revealed cards into his hand. Each player puts his remaining revealed cards on the bottom of his deck.
Hard Sound Construct
Construct
Plot Twist
4 Threshold Cost
MAV-156
Rare
Play Hard Sound Construct only during the build phase.
Put target Masters of Evil character card with cost 2 or less from your KO'd pile into your front row if you do not control a character with the same name as that card. KO that character at the start of the recovery phase this turn.
Hibernaculum
Plot Twist
3 Threshold Cost
MAV-074
Common
As an additional cost to play Hibernaculum, discard a Squadron Supreme character card.
Put the top three cards of your deck into your KO'd pile. You may return a character card from your KO'd pile to your hand.
Hired Hit
Plot Twist
2 Threshold Cost
MAV-218
Rare
Stun a Crime Lords defender you control. If you do, remove all defenders from this attack, and target non-defending character you control becomes the defender this attack.
Karla Sofen ◊ Meteorite, Twin Moonstones
Character
Thunderbolts
8 Cost
23 ATK / 23 DEF
Flight, Range
MAV-101
Rare
Loyalty
While you have 1 or more endurance, your opponents cannot lose the game and you cannot win the game.
Legendary Battles
Plot Twist
2 Threshold Cost
MAV-034
Common
While team attacking this turn, Avengers characters you control get +1 ATK and cannot be stunned.
Marcus Daniels ◊ Blackout, Darkbringer
Character
Masters of Evil
3 Cost
4 ATK / 5 DEF
MAV-135
Common
Reservist, Concealed"”Optional (You may have this character come into play in the hidden area.)
Pay 1 resource point >>> Masters of Evil characters with cost 4 or less you control have reinforcement this turn. Use this power only if Marcus Daniels is visible.
Melissa Gold ◊ Songbird, Heroine Unbound
Character
Thunderbolts
6 Cost
13 ATK / 12 DEF
Flight, Range
MAV-102
Common
Whenever Melissa Gold attacks, you may ready her. If you do, she cannot attack this turn and you cannot use her activated powers this turn.
Might Makes Right
Plot Twist
1 Threshold Cost
MAV-196
Common
As an additional cost to play Might Makes Right, discard a card.
Target attacker you control gets +3 ATK this attack. If you have no cards in hand, that attacker gets an additional +2 ATK this attack.
Monica Rambeau ◊ Captain Marvel, Lady of Light
Character
Avengers
5 Cost
9 ATK / 9 DEF
Flight, Range
MAV-018
Rare
Leader: Pay 3 endurance >>> Ready all team attackers adjacent to Monica Rambeau. Those team attackers cannot cause breakthrough this turn. Use this power only once per turn.
New Identity
Plot Twist
Ongoing
2 Threshold Cost
MAV-117
Rare
Choose a Thunderbolts character you control.
Ongoing: At the start of the recovery phase, put a +1 ATK / +1 DEF counter on the chosen character.
Nighthawk, Kyle Richmond
Character
Squadron Supreme
5 Cost
9 ATK / 9 DEF
MAV-059
Common
Reservist
Leader: Characters adjacent to Nighthawk can attack hidden characters.
Equipped characters adjacent to Nighthawk get +1 ATK / +1 DEF.
Other-Earth
Plot Twist
3 Threshold Cost
MAV-075
Rare
Play Other-Earth only if you control a Squadron Supreme character.
If you played no other plot twists this turn, characters your opponents control lose and cannot gain reinforcement and get -2 DEF while defending this turn.
You cannot play plot twists this turn.
Peace in Our Time
Plot Twist
Ongoing
2 Threshold Cost
MAV-077
Uncommon
Play Peace in Our Time only during the build phase and only if you control a Squadron Supreme character.
Ongoing: At the start of the recovery phase, each player who controls one or more characters that caused breakthrough this turn discards a card.
Polaris, Lorna Dane
Character
X-Men
4 Cost
7 ATK / 7 DEF
Flight, Range
MAV-204
Uncommon
At the start of your attack step, characters your opponents control lose flight and range this turn.
Power Princess, The Last Utopian
Character
Squadron Supreme
7 Cost
16 ATK / 15 DEF
Flight
MAV-060
Rare
Leader: Whenever a character adjacent to Power Princess causes breakthrough, each player loses 2 endurance for each card in his hand.
Power Princess, Zarda
Character
Squadron Supreme
4 Cost
7 ATK / 7 DEF
Flight
MAV-061
Common
If Power Princess would cause breakthrough while attacking a character, instead, a character of your choice gets +3 ATK / +3 DEF this turn.
Project Liberator
Plot Twist
2 Threshold Cost
MAV-118
Rare
Play Project Liberator only during your recruit step.
Characters you control cannot be the target of plot twist or payment effects this turn.
At the start of your recruit step, if Project Liberator is in your KO'd pile, you may discard a Thunderbolts character card. If you do, you may return Project Liberator to your hand.
Project Utopia
Plot Twist
Ongoing
3 Threshold Cost
MAV-078
Rare
Choose a Squadron Supreme character you control.
Ongoing: Whenever the chosen character stuns a defender, that defender's controller loses 4 endurance.
Whenever the chosen character causes breakthrough, KO it.
Quicksilver, Mutant Avenger
Character
Avengers
3 Cost
4 ATK / 5 DEF
MAV-020
Common
Reservist (You may recruit this card from your resource row. If you do, you may put a card from your hand face down into your resource row.)
Whenever a defender becomes stunned by one or more team attackers you control, ready Quicksilver.
Repel Attack
Plot Twist
1 Threshold Cost
MAV-039
Common
Target leader defender you control gets +1 DEF this attack for each non-stunned character adjacent to it. If that defender has the Avengers affiliation, it has reinforcement this attack.
Spider-Man, Peter Parker
Character
Spider-Friends
4 Cost
7 ATK / 7 DEF
MAV-209
Rare
Evasion
Pay 1 endurance >>> Stunned Spider-Friends characters you control cannot be the target of effects your opponents control this turn.
Characters with evasion you control get +1 DEF while attacking and +1 ATK while defending.
Supreme Sanction
Team-Up
Plot Twist
Ongoing
2 Threshold Cost
MAV-189
Common
Play Supreme Sanction only if you control an Avengers character and a Squadron Supreme character.
Ongoing: Characters you control, as well as cards in your hand, deck, and KO'd pile that have either the Avengers or Squadron Supreme affiliation have both affiliations.
Revealed character cards in your resource row have reservist.
System Failure
Plot Twist
2 Threshold Cost
MAV-200
Rar
Remove target attacker from this attack if its ATK is greater than twice its printed ATK.
The Wrecker, Wrecking Crew
Character
Masters of Evil
6 Cost
13 ATK / 12 DEF
MAV-145
Common
Reservist
Other Wrecking Crew characters you control get +1 ATK / +1 DEF.
Pay 1 resource point >>> Wrecking Crew characters you control get +2 ATK and can attack hidden characters this turn. Use this power only once per turn.
The Wrecking Crew
Plot Twist
2 Threshold Cost
MAV-161
Common
Target Masters of Evil attacker you control gets +2 ATK this attack. Non-Army characters you control that share a cost or version with that attacker and are adjacent to it get +2 ATK while attacking this turn.
Thor, Odinson
Character
Avengers
4 Cost
8 ATK / 7 DEF
Flight, Range
MAV-025
Rare
As an additional cost to recruit Thor, reveal an Avengers character card in your hand or resource row.
Whenever Thor causes breakthrough to a player, put the top card of your deck into your KO'd pile. That player loses endurance equal to the cost of that card.
Two Worlds, Team-Up
Plot Twist
Ongoing
2 Threshold Cost
MAV-041
Common
Choose two team affiliations among characters you control. If you chose Avengers and a different affiliation and you control another face-up resource named Two Worlds, draw a card.
Ongoing: Characters you control, as well as cards in your deck, hand, and KO'd pile that have either of the chosen affiliations have both affiliations.
Walk Through Walls
Plot Twist
4 Threshold Cost
MAV-042
Rare
Play Walk Through Walls only during your recruit step.
Discard a card. Move target Avengers character you control to your hidden area. That character cannot be the target of effects your opponents control this turn. At the start of the recovery phase this turn, move that character to your visible area.
Windstorm
Plot Twist
2 Threshold Cost
MAV-203
Common
Target character with cost 2 or greater you control has flight this turn. That character gets +2 ATK while attacking this turn and an additional +2 ATK while attacking this turn if you control another character with the same cost as that character.