I don't think it is one exclusive game, I think there might be a number of games and Gears of War 3 might have overshadowed them.
- Valhalla Games might be working on a Xbox 360 exclusive (They said something in this direction and it is rumored that Itagaki might show up @ MS E3 press conference)
- Firebird studios are working on something
- Rare is working on 4 projects I think
- Mistwalker is working on something
- Valve must be working on something
- Turn10 is working on PGR5
- Mass Effect 3 should release in 2011
They might have 3-5 exclusive games for holiday season 2011 and for them to succeed, they need to get some attention as well and not just Gears of War 3.
And of course there is MW3 and some other pretty big multiplat games so I doubt 2011 will be boring. Gears 3 is enough to get me excited.
Imagine not having GamePass on your console...







