Not entirely convinced there will be a significant difference over 720P and 1080P to most people, when you consider the majority of households (in the UK at least) TV sets range between 32' & 42'. Those size TV sets offer litte visual improvement, or too little to notice to the naked eye. So unless you game on a 50' plus screen 720 & 1080 is not that important IMO.

PS3 runs Wipeout HD at 1080p & 60fps, so there really is no excuse why this supposed "next gen" machine couldn't run all it's 1st gen. games at 1800p, especially a side scrolling 2D platformer.

It is looking VERY likely that Wii-U will only be as powerful as what we already have available, as pc's have been running higher resolutions than this at 60fps for several years now, without issue, so if Wii-U really were next gen. then the games would run at 1080p with no problems, that would be the easy part for developers, the harder part would be the frame rate.

So, it is all but confirmed that Wii-U is a Xbox 360 in different wrappings, & with a gimmicky, IPad looking controller.

Exactly Chris...This guy is obviously just trying to chop down the "superior" to Wii-U, perfection in a black box, we call PS3.
There are also several other games that run in 1080p at 60fps on PS3 & possibly even 360 (not sure which ones, as admittedly PS3 is my main console, even though I own all 3, & I tend to own, play & know more about PS3 games, although it may have been Wii-U is a few months if it wasn't looking to be this gens Wii).

Dunno why IHateYouFanboys, you decided in your infinate wisdom, that uses variable framerates. I think you must look in the mirror & think, "jeez, I hate myself", as your fanboy spectacles you threw on to look at WipeoutHD are giving you an innacurate reading, as the game looks the same stunning resolution all the way through, & it makes many full price, retail release disk based games look like sh!t & run like sh1t.
WipeoutHD is an amazing feat, & considering no other PS3 games that look as good as this, (& once you have the Fury dlc or version, it looks even better) run at near as good a frame rate. I think you really are a Sony hating fanboy, or maybe just need a trip to your local optomitrist for a eye check.

And as Chris said, resolution & frame rate are 2 totally seperate issues, so how you've managed to link the 2 takes fanboyism to new heights.
And frame rates aren't usually variable either, they are usually locked at 30 or 60fps, & in more cases than not, if they dip below that, then the frame rate is dropping due to bad performance, thus bad programming. (Kind of like The Orange Box, Bioshock & many others on PS3 in the early days, when some developers were too lazy, or stupid to get better performance out of the machine, which is apparently the case with Black Ops on PS3, for a more recent example).

WipeoutHD does not dip below 60fps, & obviously is 1920x1080 (1080p) from beginning to end.

LOL this game look so simple and graphically it's not that spectacular. So I guess 1080p will be easy for Wii U to render...