They will hold their "Game On, the Xbox E3 2014 Media Briefing" on June 9 at 9:30AM (PT).
During the briefing, you’ll be treated to everything from in-depth looks at previously announced games to trailers for our unannounced games coming in 2014 and beyond. You can stream Xbox: Game On live beginning on June 9 at 9:00 AM PDT with our pre-show coverage on Xbox.com, Xbox Live, and Windows Phone globally. You can also watch Xbox: Game On on Spike TV in the U.S. and Canada at 9:30 AM PDT.
With a name like "Game On" I can only assume they will be talking about more TV stuff and again give Sony the chance to react in their later conference. I kid, I kid.