Furthermore, those games that do support voice chat cannot make use of the microphone and speakers built into the Wii U GamePad. Rather, gamers will have to buy a licensed headset from a third-party manufacturer, much like the one from Turtle Beach shown above.
If you want to chat while using the Wii U's Pro Controller, then your options are even more limited. As that controller doesn't have a headphone jack built into it, you must make use of the Wii U GamePad as a "docking station" that your headset can plug into.
(via Ars Technica)