Video chat is a go guys!
During the Nintendo Direct conference, Nintendo played a demonstration video showing some interactive features unique to the system.
The first is a game FAQ message board function that allows the player to ask questions about certain sections of a game. The second major feature is a built-in video chat function, which uses the Wii U GamePad's built-in camera to allow friend-to-friend video communication.
All of these functions can be used while the game continues to run in the background.