Playable games at the PlayStation booth includes:

EDIT: Full lineup here including games that are at the show bot don't have playable demos.

 http://www.dualshockers.com/2014/09/12/sony-announces-full-tokyo-game-show-line-up-70-ps4-games-33-for-ps-vita-deep-down-will-get-a-trailer/

EDIT 2: SCEJA TGS booth map.

http://www.dualshockers.com/2014/09/12/sony-publishes-tokyo-game-show-booth-map-and-livestreamed-event-schedule-including-bloodborne/

PlayStation 4

• Astebreed (Playism)
• Bladestorm: The Hundred Years’ War & Nightmare (Koei Tecmo)
• Bloodborne (SCE)
• Dead or Alive 5: Last Round (Koei Tecmo)
• Destiny (SCE)
• Disgaea 5 (NIS)
• Dragon Ball Xenoverse (Bandai Namco)
• Driveclub (SCE)
• Earth Defense Force 4.1: The Shadow of New Despair (D3 Publisher)
• EA Sports UFC (EA)
• The Evil Within (Bethesda Softworks)
• FIFA 15 (EA)
• Guilty Gear Xrd: Sign (Arc System Works)
• LEGO Movie: The Game (Warner Bros.)
• LittleBigPlanet 3 (SCE)
• Minecraft: PlayStation 4 Edition (Mojang)
• Octodad: Dadliest Catch (Young Horses)
• Omega Quintet (Compile Heart)
• One Upon Light (Singapore University of Technology and Design)
• The Order: 1886 (SCE)
• The Playroom (SCE)
• Pro Evolution Soccer 2015 (Konami)
• Resident Evil: Revelations 2 (Capcom)

PS Vita

• Airship Q (Cygames)
• Chaos Rings III: Prequel Trilogy (Square Enix)
• Deadman’s Cross (Square Enix)
• Deemo: Last Rehersal (Rayark)
• Dengeki Bunko Fighting Climax (Sega)
• God Eater 2: Rage Burst (Bandai Namco)
• Gundam Breaker 2 (Bandai Namco)
• Jikkyou Powerful Pro Yakyuu 2014 (Konami)
• The Legend of Heroes: Sen no Kiseki II (Falcom)
• Minecraft: PlayStation Vita Edition (Mojang)
• Murasaki Baby (SCE)
• OlliOlli (Roll7)
• Phantasy Star Nova (Sega)
• TorqueL (Playism)
• Samurai Warriors Chronicles 3 (Koei Tecmo)

PlayStation 3

• Kingdom Hearts HD 2.5 Remix (Square Enix)
• Tales of Zestiria (Bandai Namco)

PlayStation 4 virtual reality headset Project Morpheus will also be playable. Details on test titles will be published at a later date.

Additionally, Sony will introduce a “TGS Navi” section to the official smartphone PlayStation App, which will let you access the booth map, stage event schedule, and other booth information.