My prediction:
AC: 4-7 Mil
GoW 2: 5-7 Mil
Resistance 2: 2.5-4Mil
LBP: 2-4Mil
Fable 2: 3-4 Mil
Wii Music: 4-10 Mil
Wii Music is so uncertain... I voted for it but it could easily "flop". GoW 2 is the game that is guaranteed to sell extremely well.
How many cups of darkness have I drank over the years? Even I don't know...