Tomorrow, er today, Tag Force comes out. The promos aren't all that wonderful, IMO (official text and card data in RONIN later today).
I believe the next one is called 'Spirit Summoner' and it's for Nintendo DS. I don't think an official release date for the US has been set, but you can check konamistyle.com.
Here are some random, unofficial fan-lations of the cards. My copy of Tag Force really does come in later today, so I promise the GX02s will be up soon.
The really good cards seem to come from the 'World Championship' series of GameBoy Advance games. I'm sure there will be a new one of those come February or March.
(fanlations from GameSpot forums)
TAG FORCE
GX02-001
Light/Beast-Warrior/4/1300/1300
Mystical Beast Crosswin - If this card is in the graveyard, increase the attack strength of monsters with [Mystical Beast]on the field in its name by 300 points
GX02-002
Earth/Beast-Warrior/4/1700/0
Mystical Beast Wild Horn - If ths card attacks a monster in defense position, if the attack strength exceeds the defense strenght of that monster, inflict the difference as battle damage to your opponent's lifepoints
GX02-JP003
Light/Beast-Warrior/4/700/2000
Mystical Beast Thunder Pegasus - You can activate this effect, if an opponent's monster declares an attack. By removing this card existing in your graveyard from the game, the battle damage 1 monster on your side of the field with [Mystical Beast] in its name would receive is reduced to 0. At this time, that monster is not destroyed by battle.
SPIRIT SUMMONER
GX03-JP001
Brain Crusher
Insect/???/7*/2400/500
A monster destroyed as a result of battle by this card is Special Summoned to your side of the field at the End Phase. You can only use this effect once per turn.
GX03-JP002
Hunter Owl
Winged Beast/Wind/4*/1000/900
This card gains 500 ATK for every WIND monster on your side of the field. As long as there is a WIND monster on your side of the field (excluding this card), your opponent cannot attack this card.
GX03-JP003
Masked Chopper
???/Earth/1*/100/100
When this card destroys 1 of your opponent's monsters as a result of battle, your opponent takes 2000 damage.