Every Nintendo game ever!
Alright I'll list some specifically:
More great new IPs like ARMS and Splatoon
Mario Kart 9
Smash Bros. 4 Switch
Lugi's Mansion 3
Zelda BotW 2
Kirby
Pokemon
Animal Crossing
Advance Wars
Battalion Wars
Kid Icarus Uprising port/sequel
2D Metroid
Mario Strikers
GOOD Mario Party
GOOD Paper Mario
GOOD Star Fox
These are not my E3 expectations of course.