This December 8th will see the 'Hot Holidays Car Pack' on Xbox Live, though that isn't free. It'll include 10 hot 2010 cars for 400 MSP.
The Rhys Millen Racing Red Bull Hyundai Genesis Coupe, the HKS Genesis Coupe and the special Forza 3 Genesis Coupe are completely free with the Hyundai Car Pack. If you want those hot and sleek 2010 models of car though it'll cost some pennies.
Vehicular studs like the Ferrari 458 Italia are included in the 'Hot Holidays Car Pack', with Microsoft throwing undecided gamers a bone with a 2010 Audi S4 free taster. We'vewith Forza Motorsport 3; washing cars and tearing up tracks - you?