These games are definate:
Resi 5
Fifa 2010
Halo 3: Recon
I have to say though it doesn't look such a good of a year as 2007 or even 2008. Its looks average in terms of exclusives. (Still better than PS3s 2007!)
End of '08 predictions (made by theprof00): PS3: 20m, 360: 23.5m, wii: 42m
Now Playin': PS3|Resistance 2, LBP, Uncharted and Fifa 09, PSP| Ratchet and Clank: Size matters, 360| Gears of war 2 and Fallout 3.