Speculation time! I'll have a go.
OPM UK made comments about a "super sexy secret game" being announced at TGS.
http://www.qj.net/OPM-Sony-s-super-sexy-secret-game-will-be-revealed-at-TGS-next-month/pg/49/aid/124410
And now herein lies the problem/mystery: all of the (admittedly vague) signs point towards this game being Western developed game, so why the hell is it being announced at an eastern game show?
Wait, do western programming gurus deliver a top of the art JRPG games now, while waiting for japanese developers do a homework of the thisgen 3d power machines
I don't see any reason this to be a western-taste game (read: FPS game), TGS is not the place to announce any. Must be a some sort of RPG game with asian style storytelling.