The Wii's online service was.......lacking.
With the Wii U it was thought that Nintendo would have to beef up it's online presence.
Instead we find out this fact.
Ingame chat will only work with SOME of it's controllers.
For users who want to use the Pro Controller you'll be unable to connect a headset to it at all.
What you'll have to do is hook your headset to the pad controller and then use that for voice chat while you use the Pro Controller.
Besides the inconvenience of being tethered to the pad controller users will also have a 3 hour limit on their gameplay because then the pad will need to be recharged.
This kills Nintendo's online service from the start. The idea of having to use two controllers to have something as simple as voice chat is unacceptable.