Electronic Arts will hold their E3 press conference at the Shrine Auditorium on Monday, June 9 2014, according to IGN. Microsoft, Nintendo, Sony, Ubisoft and EA traditionally hold their own annual press conferences before E3 proper begins.
This is the first of those big conferences with a confirmed date for this year's E3. Expect it to be live-streamed by EA or a partner, and for the internet to get pretty excited. The 1pm time slot is the same as last year, which suggests those other companies might have the same slots too.
The EA talk takes place just before the official opening of E3 2014, which will run from June 10-12 in Los Angeles.