Nintendo has confirmed that two Wii U GamePads can be used at once. Whilst there had been much speculation about whether or not a second controller could be used at the same time, Reggie Fils-Aime has just revealed at the E3 conference that two GamePad controllers will indeed be able to be used as part of the Wii U experience. For the show floor, though, the focus will be on solo experiences.
It was also revealed that the GamePad features a volume button to adjust the sound on the controller itself or even the TV, plus has a headphone port to make the GamePad-only experience truly immersive.