IdeaMan, when you said that 720p+controller is the most likely set-up for Wii U games, do you know if that's 30FPS or 60FPS?
For the projects of my sources, it's roughly 30 fps, in a V4 dev kit context with complex scenes rendered on the 480 padlet.
But it was in a certain step in development, before the arrival of "v5" dev kits, 2 SDK revisions before the currently available one, etc, etc. So you'll have like 4 or 5 layers of more optimizations/refinements/overall increase before release. Now, will they choose to run their game at, let's say, 45 fps, or go for 25/30 fps but with a lot of nice FX, and neat image quality with good amount of anti-aliasing and texture-filtering, from what i've heard, it clearly tends toward the latter case.
Again, the situation could be different for first-party titles, tailored from the beginning to the Wii U particularities, it may depend on the game also, less intricate geometry/scenery/demanding effects for 60 fps (party games, sports, etc.), and 30 fps for a content focused on solo campaign, etc.