Just downloaded the demo at it seems pretty faithful, the opening vid is a good watch.
Runs at 60fps on the One X and graphically looks really nice.
Demo is only available via digital preorder (I plan to cancel and buy physical), you play as Tony in Warehouse for 2 mins - nothing too elaborate but good to know how it plays etc, which is as I remember.
Just a slight grievance, every time you do a trick Tony makes "wooo" noises, there seems to be a total of 2 or 3 whole variations so that gets stale quickly. Other than that, very much looking forward to 4th Sept.