Backward compatible cuts both sides.

Level 5 - 1 vita multiplat

Fantasy Life
Inazuma Eleven Go 2 + Inazuma Eleven 1.2.3!! Legend of Endo Mamoru
Little Battler eXperience W
Professor Layton vs. Ace Attorney
Professor Layton and the Ruins of an Advanced Civilization
Layton Brothers Mystery Room

+ 2 unannounced game (1 is probably Youkai Watch - most likely for PS3)

Capcom too - no Vita

Monster Hunter 4 (playable debut)
Resident Evil 6
DmC Devil May Cry
Lost Planet 3
E.X. Troopers
Airu De Puzzle

And Sega - 1 Vita Multiplats

• Yakuza 5 (PS3)
• Yakuza 1&2 HD Edition (PS3)
• Phantasy Star Online 2 (PSV, iOS, Android, PC)

Electronic Arts, which is partnering with SEGA in Japan this year, will be bringing 2 more

• FIFA 13 World Class Soccer (PS3, 360, PSV, PSP)
• Medal of Honor: Warfighter (PS3, 360, PC)
• Need for Speed: Most Wanted (PS3, 360, PSV, PC)

But like I said, they're all partial, so that does not means no vita games. It's certain some games (even a lot) will be announced. Especially since Sony attends TGS too, unlike Nintendo.

Here's the list of TGS exibitors (I'll put it in the OP too)

I'll bold the big ones that showed their line up, like a checklist

ARC SYSTEM WORKS Co., Ltd.
ASCII MEDIA WORKS INC.
AVATRIP (Russia)
Bushiroad Inc.
Capcom Co.,Ltd. - Line-up announced
China Pavilion (China)
Guangzhou Aipai Network Technology Co.,Ltd (China)
Hangzhou Xuanji Science&Technology Information Corporation (China)
Nanjing Bbmf Information Technology Co., Ltd. (China)
Nanjing Magic Cube Technology Co., Ltd. (China)
Nanjing Nine Elements Film TV & Gartoon Co., Ltd. (China)
NedDragon Websoft Inc. (China)
Original Force 3D Animation Studio (China)
Shanghai Giant Network Science & Technology Co., Ltd. (China)
Shanghai Internationalo Cultural Service and Trade Platform (China)
Shanxi Bough Animation Company (China)
Shanxi Huizhong Animation Technology Development Co., Ltd. (China)
Shengqu Information Technology (Shanghai) Co., Ltd. (China)
Zhejiang Sinour Industry Co., Ltd. (China)
Zhejiang Zhongnan Animation Co., Ltd. (China)
D3 PUBLISHER INC.
ENTERBRAIN, INC.
GameSalad
gloops, Inc.
G-mode Co., Ltd.
GREE, Inc.
HAPPINET CORPORATION
KONAMI
KOZIN-MON／KGS／SOGOGAKUEN HUMANACADEMY
LEVEL-5 Inc. - Line Up announced
MEDAROT INC
MORI GAMES CO., LTD.
MUNAZO INC.
NADESHIKO STYLER
NAMCO BANDAI Games Inc. - Line-up announced
PROTOTYPE CO., LTD.
Scanavo Manufacturing Hong Kong Ltd. (Hong Kong)
SECT INTERNATIONAL CORPORATION
SEGA CORPORATION - Line Up-annouced
SIGGRAPH Asia 2012 (Singapore)
Sony Computer Entertainment Inc.
SQUARE ENIX CO., LTD. Line-up announced
SteelSeries (Denmark)
Taiwan Game Pavilion (Taiwan)
Art and Mobile Entertainment Co., Ltd. (Taiwan)
Dept. of Multimedia and Game Science, Lunghwa University of Science and Technology (Taiwan)
International Games System Co., Ltd. (Taiwan)
MOBAGEL INC. (Taiwan)
X-LEGEND Entertainment Co., Ltd. (Taiwan)
XPEC Entertainment Inc. (Taiwan)
Taiwan External Trade Development Council (Taiwan)
TECMO KOEI GAMES CO., LTD.
VUZIX Corporation (USA)
Wizards of the Coast LLC (USA)
Zhejiang Pavilion (China)
FanFan Comic Technology Co., Ltd. (China)
Hangzhou StarQ Information Technology Co., Ltd. (China)
Zhejiang Dishun Tech. Co., Ltd. (China)
Zhejiang Zhongnan Group Cartoon and Animation Television Co., Ltd. (China)

I think this TGS will be all about the PSP and 3DS, with some games for WiiU and PS3, and Vita.

Fewer games than expected for Vita so far, but still very early days.

Of the big ones just Konami and Sony haven't released their line-up yet

Konami most likely won't have big surprises since their biggest game just got revealed .... BUT there's always that Goemon teaser :)
But the spotlight is all on Sony now

We also ignore what Tecmo Koei has in stock. Ninja Gaiden 3 should be there, and then there's the chance of a new Dead or Alive or Dynasty Warriors.

Maybe even a new Fatal Frame/project Zero for WiiU with the controller as the camera.

ffx hd vita

Yeah, Tecmo too. Not on the same level of those I mentioned, but definitely reigns supreme in the 2nd row

It's just unfortunate that TGS does not have Atlus, Natsume, NIS and Falcom.

Or Nintendo.

Ah, but they do "attend" to it

1 - They will probably have a conference close to TGS, like most previous years.

2 - Other companies announce games for their systems, it's not like there will be no 3DS support or Wii U if Nintendo is not there.

But in the same way, I think Sony can, for example, announce an Atlus Vita game during their presentation or a Capcom's. It's still very open.