Is it a Super Mario game or a Super Mario Bros game? One is 3D and the other is 2D, it is mentioned both ways in the article. I have said before that I think the first Mario game on Wii U would be 3D because it would show off the graphics the best, which in turn might wow some people and help get an install base.
A 2D Mario will end up selling more long-term, but it wouldn't really take advantage of a newer powerful console, plus you are probaly better of making a 2D game after you have the install base, because of that I would say they should wait till 2014 before a 2D Mario hits Wii U, if they launch with a 2D game it could be a while before they even have 20-30M Wii U's in the households to buy it.
I'm pumped either way, though.