Great start with Mario + Rabbids sequel.
I'd be happy with BotW2 featured and release window, Zelda WW+TP pack announced for this year, either new 2D Metroid game or MP Trilogy coming this year, new model revealed, and at least a sneak peak of Metroid Prime 4. Also interested in seeing some footage and details of this rumored 2D DK game. Oh and some gameplay footage of Pokemon Legends would be cool, interested to see if that game is gonna be really awesome or not. Finally, would love to at least here that they are working on a 2D Mario game for Switch (I mean how could they not be?!), though with first party software already pretty packed for the next year I figure maybe that'll make a debut at next year's E3.