The Nintendo Direct stream casually featured a Black Wii U.
Wii U may come in black along with the customary white.
In the background of the Nintendo Direct video was a black Wii U system, as well as a black Wii U GamePad. Up until this point, Nintendo has not shown the Wii U in any color except white.
While this does not confirm what colors will be available when the system launches, it does raise the prospect that the hardware will come in both black and white.