https://www.gamespot.com/articles/e3-2018s-xbox-press-conference-will-include-a-lot-/1100-6459569/

The E3 2018 Xbox briefing, which is around 100 minutes long, will apparently include a lot of game reveals and other big announcements. Xbox boss Phil Spencer said on Twitter that he is excited to "world premiere 15 games" during the event, and announce "much, much more." The exact wording leaves some things ambiguous, however, as "world premiere" could mean the premiere of a new mode for an announced game or something other than a full game announcement.

He tweeted after finishing the final rehearsal for the Xbox briefing. Spencer didn't tease any of the reveals. However, EA announced during its own briefing today that more details on Battlefield V's single-player mode will be announced during the Xbox briefing.