This was expected for Splatoon and I remember the first demo being this super rad event on Twitter everyone was talking about.
But I'm wondering about demos in general. 1 2 Switch needs one I believe, but what would you put in that demo? You can't just offer the best minigames for free unless you add an arbitrary play limit like on the 3DS.
Zelda could have a limited version of the grant plateau as a demo.
Would be nice to see a timed demo for 12S, as well as MK8D & ARMS and maybe a few levels of Snipperclips.
Come on Nintendo. Hook us up!