The game in question is Rag Doll Kung-Fu, and he’ll be made available as a playable character as part of tomorrow’s PlayStation Store update, where he’ll join the game’s unlockable characters in a “time savers” pack (as in, pay money for the pack, save you the time unlocking them).
If only LittleBigPlanet could repay the favour, and add a pack that lets you unleash some adorable little roundhouse kicks.