The new project from Ryu Ga Gotoku was given an airing at today's Xbox Partner Preview showcase. Formerly known as Project Century, part of what attracted me to Stranger than Heaven when it was shown last year was that it seemed to be disconnected from the Yakuza / Like a Dragon series, which is something Ryu Ga Gotoku hasn't really done since Fist of the North Star.
But no: Stranger than Heaven seems undeniably linked to the Yakuza world, at least to the extent that it'll return to the ageworn stomping ground of Kamarocho. That's confirmed as much in the new trailer, which looks, honestly, incredible to me, despite my slight disappointment that it's not a whole new thing for RGG.