GoNintendo says this:
It's not a Pro Controller apparently. It's hardware is a combination of the Wiimote and classic controller. What a let down. If the game doesn't support classic controller, then it may not support this.
Did they have an actual hands on with this controller? The pre-order write-ups I've seen make it seem like it doubles as a Wii U pro controller and original Wii Classic controller pro. If it doesn't support all of the new Wii U pro controller functionality, this will be a huge let down... and I was planning on getting 4 of them.