Yep, Bethesda is going be at E3 2019. No idea if Pete Hines or Todd Howard will be there; they've been silent on social media since the FO76 controversies.
Bethesda’s show takes place on Sunday, June 9. Though the event’s venue has yet to be revealed, the show will be streamed live beginning 5:30pm PT, 8:30pm ET, 1:30am UK (June 10). SOURCE.