I recently watched a video detailing what some people hope the NX has, and one of them was VR Support. I could take it or leave it, but if they do, I really hope they call it the Virtual Boy.
Aside from that, I just hope they go look back to the Gamecube. To me, that console had the biggest impact on me as far as wow factor. Opening Pikmin and Luigi's Mansion that Christmas morning, that startup jingle, that bizarre controller, THE GRAPHICS.
The Gamecube's technical specs weren't quite on the same level as the PS2, but they made beautiful games despite that. Innovative, unorthodox controller, EXCELLENT launch lineup, although now I think people will be expecting a core mario and zelda game, as well as a pack in game and an original IP. It'd sure be nice.
I think they also need to drop the "Wii" moniker as well. It's time. I don't think they'll stick with the NX title, so I hope we don't get some kind of Wii3 or something.
All in all, unless it's a COMPLETE catastrophe, I'll be getting one.