On 1ups 9/14/07 podcast they were able to find out a few of the games that are coming out for the PS3. Not sure if they'll all be announced at TGS though. Listen to the podcast. Other than these games that they confirmed will be at TGS, they also announced that the DualShock 3 controller will finally be revealed at TGS.
(PS3) (RPG) Eternal Sonata (Trustybell) with 2 extra characters.
(PS3) (RPG) Steambot Chronicles 2
(PS3) (RPG) Persona 4
(PS3) (Flight Sim) Ace Combat 6
(PS3) (RPG) White Knight Story will be playable!
(PS3) (RPG) Star Ocean 4
(PS3) (Action Adventure RPG) Yakuza 3
(PSP) (RPG) Steambot Chronicles: Vehicle Battle Tournament
(PSP) (Action RPG) Kingdom Hearts Spin off! More Kingdom Hearts to be announced for other platforms.
(PSP) (Golf) Hot Shots Golf 2
(PSP) (Wierd? lol) Patapon (LocoRoco fans may love it)