2chan claims that Famistu has quoted Toshihiro Nagoshi, Yakuza series director, as announcing the fourth game in the Yakuza series titled simply Yakuza 3 Kenzan!
No release date or details have been announced yet.

According to 2chan, the latest issue of Famitsu quotes Yakuza series director Toshihiro Nagoshi as stating that the game is a direct sequel to Yakuza 2, and is in development exclusively for PS3. In the same article, Nagoshi states that Ryu ga Gotoku Kenzan! is actually considered a spin-off from the "main" Ryu ga Gotoku series.

Bale Fire via gamefocus.ca »