Announcements/surprises you expect at E3 2018.

[Pavolink]

Not exactly all of them as new announcements or surprises, but I expect Nintendo E3 to go like this:

Fire Emblem first footage (2018 Oct or delayed to Feb 2019)
Pokemon Switch (Nov 2018)
Smash 5 (Sept 2018 with the online) - the big focus of the show
Metroid Prime 4 first footage (2019)
Retro Studios game announcement (2019)

Not especific order, but I believe these are going to be the highlights.