I'm in day one. Give me a Zelda bundle and I am solid. My biggest hope is that battery life is at least serviceable. 5 hours at least. Come on 5 hours. My second biggest hope is that indie studios support this thing. I can see NS being my go-to for things like Inside, Shovel Knight, Owlboy, Axiom Verge, Bloodstained, etc.
See my above comment about VR. There's no reason why Nintendo couldn't approach the NX with a Google Cardboard kind of VR solution. Especially is the controllers come off the side, leaving only the screen.