A list has been circulating that lists the titles Microsoft is expected to show during their E3 press event. Keep in mind that nothing has been confirmed, so take the list with a grain of salt.
-Tomb Raider
-Forza 4
-Star Wars Kinect
-Gears of War 3
-Halo title
-Codename Kingdoms
-Sesame Street: Once Upon a Monster
-The Elder Scrolls V:Skyrim
-Steel Battalion: Heavy Armor
-Alan Wake: Night Springs (Kinect compatible)
-XCOM
-Hitman: Absolution
-Modern Warfare 3
-Spelunky HD,
-Ghost Recon rail shooter for Kinect,
-Dance Central 2
-Kinect FunLabs XCommerce
-Kinect Sports: Season 2
-Toy Soldiers: Cold War
-Fable: The Journey
-Raving Rabbids for Kinect
-Unspecified Double Fine game
-Hybrid (XBLA shooter)
-Roller Coaster Kinect
-Rise of Nightmares for Kinect
-Forza 4
-Star Wars Kinect
-Gears of War 3
-Halo title
-Codename Kingdoms
-Sesame Street: Once Upon a Monster
-The Elder Scrolls V:Skyrim
-Steel Battalion: Heavy Armor
-Alan Wake: Night Springs (Kinect compatible)
-XCOM
-Hitman: Absolution
-Modern Warfare 3
-Spelunky HD,
-Ghost Recon rail shooter for Kinect,
-Dance Central 2
-Kinect FunLabs XCommerce
-Kinect Sports: Season 2
-Toy Soldiers: Cold War
-Fable: The Journey
-Raving Rabbids for Kinect
-Unspecified Double Fine game
-Hybrid (XBLA shooter)
-Roller Coaster Kinect
-Rise of Nightmares for Kinect