Stepping away from tech talk for a bit, it's really hard to give a damn about the Wii2 if they don't try and improve the service of the device. It's incredible that the 3DS still associates purchases with hardware instead of an account. And things like friends list, achievements, custom soundtracks, proper online service, demo downloads, xbla/psn smaller games, cloud saving, etc. should be important differentiators in whatever is to come. The only thing that makes me think Nintendo might take its head out of the sand it the screen on the controller.
I think about how people use the iPad and phones as advanced remotes and things like that. It would be pretty cool to watch Netflix on the Wii2 while going through my instant queue on the controller. Or other simple, sub-tablet operations like that that integrate with the main console. It could lead to cool things in games too. Like, if anyone remembers GRAW, you could control a UAV but it would take you out of the action. It would be cool if the controller screen always had an overhead view of the action. You could give squad commands and draw paths on the screen while still providing suppressive fire on the top screen. Or any game with a hacking mini-game (Bioshock, Mass Effect, Alpha Protocol) having it take place on the bottom screen. I don't know why a screen on a controller seems interesting, but I have and continue to consider the two screens on the DS/3DS to be dumb. Probably because the DS/3DS are so shit weak that you generally don't have two graphically intensive tasks happening simultaneously. That and the DS/3DS screens are small and low res.
I'm aware that I've contradicted myself at least once in this post and it is in no way a cohesive thought...OMG SKYWARD SWORD HD WITH INFINITY BLADE-ESQUE SWIPE COMBAT REVOLUTIONARY NINTNEDO DOES IT AGAIN