I'm so freaking hyped right now. One must really appreciate that Ninty kind of stuck with the Wii U concept in its roots, but perfected it, while removing everything that held it back. I seriously believe in a great success once again. Maybe not on Wii levels, but that's like, impossible to top anyway.
And now I want my Yooka-Laylee version on that thing
Things I'd like to see as well is support for the GC controller adapter (at least for Smash) and every wireless controller since the Wii era. I doubt that they'll get rid of Bluetooth support, so this would be fair thing to offer for die hard fans.
... and things I dream about but are less likely: Cheap "upgrades" for titles I bought on the eShop that'll appear as enhanced ports on that system. That would make it much more likely for me to buy that thing on day one. At least for multiplayer hits like Splatoon or Smash.
*remembers the 3D Mario title*... crap, they're making this hard already!