Thought this would be an interesting topic because before the holidays set in pretty much everyone thought it was a sure bet WiiU would be up this holiday Q YOY, what with Smash, Mario Kart and Amiibo. As it turns out, so far, it's a very close battle.
Japan - Down 237k YOY this Q
US - Up 145k YOY this Q
Europe - Unknown
So just counting US and Japan the WiiU is down this holiday Q 92k YOY.