Supposedly a twitter user dropped some interesting details. Right now it seems like everything is a rumor so take it with a grain of salt.
http://twitter.com/GameForkBelow are some interesting tidbits:
MS E3 big drops. Xbox Fluid - New Motion camera! Splinter Cell Conviction Halo ODST Alan Wake APB Metal Gear Solid 4 + Oxide (Show Finale)
Yes. Metal gear solid + Oxide is one title.

For the questions about MGS+O being show finale: Konami will announce a 360 exclusive (NOBODY outside of Kon has been told what this is)...
.. After that they announce MGS4+O as a 360 exclusive. MS have also cut LostPlan2, AssCreed2, Bioshock 2, GTA.BAAFLC, to 3 min slots.
E3: The Molyneux / Lionhead project "Richter" will show at E3. In fact, it will open it After Progress/xbla titles are shown