Well, I'll predict about -3.14159265358979323846264338327950288419716 copies of Forza 3 sold, and 99999999999999999999 for Gran Turismo 5.
On a more serious note:
GT5 = 8-8.5 million
FM3 = 3.5-4 million
This game is definitely going to be big. That being said it will still be the lowest selling GT game. But 8 million is not bad for any game. I don't believe it will reach 9 million though. On HD consoles, the only game that will have better lifetime sales is Halo 3.








