It is definitely a big step for the series but not all has changed. The end of the trailer has the ground turn vertical which apparantly is going to be incorporated fluidly into the game. And you can connect grab moves so you'll be able to leap from enemie to enemie similer to how Kratos leapt from the Cyclops to the bird like thing. All sounds awesome.

I feel bad for doubting this game. Of course it was going to be awesome.