For me:
Reasonable:
New Smash character reveal
Some sort of "Zelda All-Stars" collection for the series anniversary
Rerelease of the Four Swords Anniversary Edition also for the aforementioned anniversary
More updates for New Horizons?
Unreasonable:
Remakes/Remasters/Any sort of fucking rerelease of the first 2 Paper Mario games :vivian-shrug:
Super Mario Odyssey 2
Official confirmation of the Switch Pro or whatever it'll be called
Pikmin 4
Nintendo 64/Gamecube Mini
Reasonable
Pokemon mystery dungeon 2 remake, More news about Zelda BotW2
Unreasonable
Dante from the devil may cry series as the next smash character, metroid prime 4, Port of kid icarus uprising