It's called Yakuza Of the End, for PS3http://www.siliconera.com/2010/09/14/surprise-yakuza-of-the-end-is-a-zombie-game/
Sega is taking the Yakuza series in an entirely, totally unexpected direction, with Yakuza: Of the End. The upcoming PlayStation 3 game is a zombie shooter set in Kamurocho. The zombie invasion took place in April 2011. Screenshots in Famitsu show the Japanese Self Defense Force overrun by the undead.
Kazuma, Goro, Ryuji, and Shun, characters from previous Yakuza games, stay behind to defend their home by shooting zombies. Players will be able to customize guns in the game, one of the screens shows Goro with a gun arm.
Toshihiro Nagoshi wouldn’t tell Famitsu if Yakuza: Of the End was a numbered entry or a spin-off like Yakuza: Kenzan. Nagoshi also said he doesn’t expect this to be the last game in the Yakuza series, but if this game isn’t a hit it may change his plans.