Didn't Ubisoft Montreal basically confirm that the next installment in the Splinter Cell franchise would be multiplatform?
However if MS are stuck for games, they have shown in the past they are willing to buy third party timed exclusives to fill their roster, so I guess it is a possibility the next SC will be timed exclusive.
Prototype 2 doesn't make much sense. The first is on the PS3 and almost half it's sales are there. MS will want platform defining games that could potentially move hardware I'd imagine, Prototype doesn't fit that bill.
Another Alan Wake will probably come down the line.
Left4Dead 3 will probably be 360/PS3/PC.








