Microsoft Cleanup Hitter for 2009 will be.....

[numonex]

Gears of War 3 or Halo 4 is likely to appear on XBox 360 in 2010. That will be a huge block buster. I assume GT 5 will come in late 2009 on PS3 and be PS3's GOTY eclipsing KZ2.
2011 either Halo 4 or Gears of War 3 will appear on the new XBox in 2011 and it could also appear on XBox 360 as well.