This could very easily be fake, but ¯\_(ツ)_/¯
A mix of stuff you'd expect to see following their last Direct and some reasonably believable new announcements, but also Switch versions of Fallout 3 Anniversary (itself a likely explanation of today's Bethesda teases) and Fortnite. I imagine a Switch version of Fortnite would probably work pretty well.
"Fire Emblem Memories" would probably be FE16 as announced in January 2017's Direct and kept quiet ever since. If they're showing it at E3 then it might actually make it out this year.
I wonder though if the possibility of Fallout 3 on Switch means the supposed Anniversary version is a simple remaster job of the original and not an all-out attempt to uplift F3 into F4's engine. But if they got Skyrim running on Switch I guess F3's scenario stuffed inside F4 isn't too huge a leap over that.