Lots of canidates as others mentioned, and none surprising as most should be expected to be multiplatform.
Splinter Cell 5 (currently "exclusive" but surely a timed one ala GTA games on the PS2)
Bioshock (announced exclusive but rumblings before announcement that a PS3 version would come and no reason for 2K not to bring it to all platforms)
KOTOR (Xbox 1 exclusive, new developer)
Lost Planet (Framework is multiplaform)
Dead Rising (Framework is multiplatform)
Ninja Gaiden (already coming)
Dead of Alive (no reason not to cross polinate now that Sega has brought the competition to Tecmo)
Elder Scrolls (already coming)
Something other than the Club from BC or Saint's Row is interesting. Games that seem to be off limits are the 2nd party ones MS publishes--Gears of War, Alan Wake, Crackdown, Mass Effect, Too Human, and so forth.