I must say the wiiU gameplay looks really solid, it looks like they have solved some of the issues with 3d sonic in this, finally they have slowed him down a notch, which if you look at the old genesis games he really was not too fast unless he was running downhill or had the fast shoes. Which makes me hope they solve the momentum and jumping problem in these games which has always been shaky since they moved to 3d, especially the jumping trying to cover up the floaty jump with a lock on (or dash attack or whatever it is called) is not good enough.
However from the video of the 3ds version I think the running and jumping still looks a bit off, unlike the wiiU version. I hope they can fix that though (which they probably won't).
My 3ds friendcode: 5413-0232-9676 (G-cyber)