I think Forza 3 will crack 5M+ overall units sold.

[DirtyP2002]

Forza 3 sales have nothing to do with GT5 sales! Or do you think Metal Gear sales will have an impact on Splinter Cell? Or Halo ruined Killzone-sales? I don't think so.

Forza sold 2 million without bundles, which is great. Forza 3 seems to be a huge improvement and racing-fans had a calm year. So I think, it could do 3.5 million, since the userbase got much bigger.

And Xbox Live improved a lot and it seems Forza focuses on that. To create your video etc is a great feature for Xbox Live Users.