Well, its not like there are tons and tons of Wii games or Wii news these days, so for all intents and purposes we might as well just consider the "Nintendo Console Discussion" forum to be the official Wii U forum (which it technically is anyway).
The one thing that should probably be done different though is instead of posting all Wii U still in a single thread just do multiple threads as necessary. I don't think there is any forum rule forbidding people from creating more Wii U threads. Its just become a tendency for everything to get placed in that one single thread. I have no problem with more Wii U threads being created instead of having one monolithic thread. But I don't see any point in creating a Wii U forum. The existing forum should suffice.