The Wii U "Pro" Controller doesn't support a headset. There doesn't exist a wireless headset either...
Nintendo, if you want me to play your games... GIVE ME A CONTROLLER
Why haven't you bought a Wii U yet?
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It's significantly less powerful than the other current gen consoles as well as there being terrible 3rd party support and most 1st party games are re-hashed titles I've already/don't want to play.