Soundwave on 14 January 2017
They already showed off quite a bit to be honest.
Mario 3D Odyessy + ARMS + Splatoon 2 + Zelda: BoTW + Xenoblade 2 are five pretty big releases, no?
I think Smash + Pokemon Stars are their big titles for E3 and I think you'll get a look at a smaller scale game(s) like possibly a Wave Race Switch, and they might throw the fans a bone by giving them a short teaser of Metroid or Retro game.
