So it doesn't exactly take a brain scientist to figure out that just in the time between the release of Gran Turismo 4and 5, the entire Forza series has risen from inception. Now that GT5 released last month, two years after the last in the Forza series, looks like Turn 10 studios already has the Forza 3 successor in on the board.
From the looks of the Teaser Trailer Forza 4 should host new racing styles, new tracks, more cars and hopefully more absolutely stunning graphics.
Lets just hope it doesn't take 15 release dates to actually get it out there.
Source: Forza Motorsport