We still don't know that. Just because Wii U is supposedly more powerful on paper than PS360 based on the rumored specs, that's not going to necessarily translate into a huge gfx boost in reality. See Wii vs Xbox/GC or even PS2 for comparison... there's only a handful of Wii games, almost all from Nintendo, that look better than most games from last gen.
And guess what? I guarantee you that 95% of future PS360 multiplat games that are also announced for Wii U in the next year or two will be straight up ports with maybe some bonus content or enhanced controls thrown in, because that's the way things work.
But that's not a bad thing... you're still finally getting all the same AAA 3rd party games that other systems have been getting for years, now just on a Nintendo console, so what's the problem? Can't have everything lol.
This is all just speculations about the future. Stop assuming that you're right and I'm wrong.