Forza 4: 500 cars, 10 times better graphics, Jeremy Clarkson?

[Winters]

Dr.Grass said:

I have to admit that Forza has stolen the racing sim crown from GT5 this gen.

10x better graphics are obviously not possible, but I think the talented guys at Turn10 might surprise us with Forza4.

Please expand on what Forza has actually done better to beat GT5?