A Nintendo representative has confirmed to Kotaku that you'll only be able to voice chat with select games. Games that will be supported include Assassin's Creed 3 and Call of Duty: Black Ops 2. The Wii U GamePad includes a mic but you won't be able to use it with in-game voice chat. Instead, you will need to purchase a headset from Turtle Beach or Mad Catz which will plug into the headphone jack. As you may already know, the Wii U Pro Controller doesn't include a headphone port. You will have to use the headset on the Wii U GamePad, even if you want to play Black Ops 2 online with the Wii U Pro Controller.