Great way to make a big deal out of nothing.
As soon as the WiiU and NSMBU were announced, Nintendo said it would be 720p. The "1080p" on the site was obviously a typo of someone who made the site, not who made the game.
Other game, announced games, will be 1080p. If the PS3 can support 1080p, the WiiU will do that without any problems.
http://mynintendonews.com/2012/10/10/wii-u-games-graphics-would-need-to-be-downscaled-on-playstation-3-and-xbox-360/
?Basically that does require? well, not huge amounts more graphics processing power, but still considerable. If we would publish that on the other consoles, then I believe that there would be some small downscaling of what it is right now.?
?I think we didn?t start really until sometime early in the year still, but the fact was that we had a lot of things going on. Then when we got over the old things, we started with the Wii U and then in two days we had it running,? he explained. ?We had it running really fast. So it was more about knowing your own tech and then having that ?eureka!? moment of making it work on this new hardware."
-Mikael Haveri, sales and marketing manager,
Frozenbyte