I have no doubt that Wii U will more powerful. We shouldn`t forget that Wii U will process images to the TV and to the pad, aswell.
And if Nintendo pulled of that garden demo and the Zelda demo in such short time, with all the time and the world and as years go bye, it can only look better!
From what i read on neogaf, ideaman seems to be legit, even being confirmed by actual Wii U developers. So, yaaay! :D