Forza Motorsport 3 will be so large, that it will ship on two discs.
This was confirmed by Turn 10’s John Wendl to Joystiq yesterday at E3.
“It is going to ship on two discs,” he said. “Disc one is the full experience, even disc one is bigger than any other racing game out there. Disc two includes a lot of extra cars, even a handful of tracks.”
There’s a trailer of the customization aspects of it here to whet your appetite for the racer.
Look for it in October.