Why do you guys think the switch will be much more powerful than even the Wii U? Zelda liked the same as the Wii U version, mario kart the same as mario kart 8, 3d mario actually worse that the Wii U mario, Skyrim was a ps3/360 era game....
I don't know, i think the switch is going to basically be a portable wii u with more power devoted to making it possible for the tablet to run cooler and have a long battery life, nothing else.
The one thing that is interesting is the big vent on top of the tablet which makes me think that the dock will probably let the switch run faster than in portable mode so that it can upscale games to 1080 and, hopefully, better frame rates.
So, yeah, i would not expect any sort of major graphical jump from the Wii U. But that's OK really, i think wii u level games on a handheld are pretty good anyway.