Highly likely the 360, PS3 and wii u versions will be very similar and all will be running at 720p 30fps thereabouts. I think as with Criterion's wii u racer the wii u may benefit from improved textures which will put it in the middle ground slightly beyond ps3 and 360.
Never listen to developers or publishers for realistic information though. We will only know what its really like when we see it. Remember all that rubbish about Black ops 2 being 1080p on wii u only to end up being the same sub 720p resolution as 360 and PS3.
I'm more interested in the possibilities of the gamepad and how it can enhance the game.