Yesterday we ran a trailer for the PS3's Gran Turismo 5, showing of the new Ferrari 458 Italia. In the interests of platform parity, you should know the car is also to be found in the 360's Forza 3.
Problem being, while Polyphony Digital are still working on GT5—meaning they can just throw the car into the game—Forza 3 is done. So Turn10 and Microsoft are going to release the thing as DLC shortly after the game's release.
The car's announcement carries no mention of the word "free", however, so don't go counting on it being an early Christmas from the studio.