This looks really great. Another one to put on my list to prompt me into getting a Wii U.
The 3DS one is looking pretty ok too.
The 3DS version is being made by Dimps, so we already know it's not good.
Dimps can make good Sonic games when they have the time and budget for one. Sonic Generations 3DS was actually very rushed, at E3 2011 they had barely done enough work for the demo there.