It would be nice if Nintendo put more thought in to the hardware power, but it looks they didn't really.
I didn't see a single thing in that trailer that wouldn't be possible on a Wii U. Yeah the Mario game looked a little better than 3D World, but 3D World had the forced isometric viewpoint to accomodate multiplayer and wasn't exactly pushing the Wii U to its absolute limit.
I also saw what appeared to be slow down on Zelda. And NBA 2K looked the same as the PS3/360 versions.
This is also in line with Eurogamer (who is now proven 100% right) that said a source of theirs who saw gameplay on the system said it was a bit better than the PS3 but in the PS4/XB1 ball park.