Here is a list of all the games that have been mentioned/rumoured/confirmed to make an appearence in Microsoft's conference
Alan Wake - HOLY FUCK!
Halo ODST - HOLY FUCK
Halo: Reach - HOLY FUCK
Forza 3 - HOLY FUCK
Lionhead Game - HOLY FUCK MILO
Lips: Number One Hits - No show, some would say this is a plus!!
Epic Game - YES
Splinter Cell Conviction - HOLY FUCK
2x Rare Games + PD XBLA - NO!!
Duke Nukem - No!
MGS4 - MGSR!!!!!!
BigPark's game - YES
Kudo - NO
Konami game .. NO
Mass Effect 2 NO
APB NO
Crackdown 1.5/2 - YES
I wonder if they will all show