For me I expect totally vibrant and high-res spectacles of story, character design and enthralling game-play.
I want to see it used blatantly (the gorgeous Nintendo graphical visual capabilities) and in "full force" all over the main UI and experience of using the Wii U.
Also these consoles "default" colour(s) were: NES (grey black), SNES (grey purple), N64 (black), GameCube (Purple), Wii (white).
I'd want the regular Wii U console colour(s) to be...
...highly reflective and shiny, reflecting... you (U). XD

Awesome things I expect!