In the time between Gran Turismo 4 and Gran Tursmo 5, Microsoft launched a serious competitor to the Polyphony racing simulator….and then managed to release two sequels to Forza Motorsports before Kazunori could get his act together and release the slightly physics challenged GT5. And just after the release of the much-delayed Gran Turismo game, Forza is showing the trailer for the fourth installment of its racing sim.

There's no actual game play (as it's mostly Top Gear USA footage), but for those Xbox owners tired of Forza 3, a new challenger awaits in 2011.