Yes, I think it was Aonuma who said it, to either GameSpot or something similar... I remember it getting lost amongst all the other stuff, and was surprised not to hear it anywhere again. He did mention though, that the experience would be the same, so that's a bit of a shame for Switch owners...
Do we even know if the video from the Switch reveal was even from the Switch itself? Wouldn't that sort of thing be green-screened in?
yes, Nintendo said during e3 that the main difference between the Wii U and "NX" versions would be the graphical improvements of the "NX" version. Sorry I can't...