http://cube.ign.com/articles/594/594565p1.html
There is a video , looks pretty cool
Exact details about the gameplay elements, characters, and stages have not yet been confirmed, but based on the promotional trailer, Shadow appears to mix the classic 3D platforming elements of Sonic Adventure with the insane weapon shooting of the Ratchet and Clank series. Of course, this only based on what we've seen from the trailer, so I'm sure there's more to the game than just that.
There is a video , looks pretty cool