200 Cars, a vast open world experience, Drivatar support from Forza Motorsport 5, and many more features were detailed during the Microsoft Media Briefing at E3.
A true open world experience seems to be the main feature of Forza Horizon 2. You can race anywhere, anytime and your friends can challenge you to races and jump in and out of your game seamlessly.
Forza Horizon 2 launches worldwide Septmber 30th for Xbox One.