Microsoft has announced (via GameSpot) the date for their E3 2016 press conference.
Their press conference will go down on Monday, June 13th at 9:30 AM Pacific. An email invite was sent out to press, stating:
“We’re excited to return to E3 this year where we’ll showcase more games and experiences coming later in 2016 and beyond, starting with our briefing at 9:30 AM PDT on Monday, June 13.”