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This is a rumor that should be taken with a grain of salt. A posting on the Xbox One subreddit says that a trailer teasing Microsoft's Xbox E3 plans will be going live soon. The trailer was supposedly seen by a few people, one of which decided to post their findings on the aforementioned subreddit without much in the way of proof.

The user, dieklobrille, claims that the trailer is already sitting on Microsoft's servers and is just waiting to go live to the public at some point ahead of E3. However, it's what the user saw in the Xbox API that is more interesting.
• Rare is working on a new Battletoads (maybe just the Rare name though like at the Killer Instinct reveal trailer, game could also co-developed by another studio)
• Sea of Thieves won't be a straight MMO, more like The Division/Destiny, seems like MS will give this game a huge focus, cross-play, cross-buy
• FH3 set in Australia
• General RAAM for Killer Instinct
• Something Age of Empires (still not sure what exactly, prob new game)
• Halo Wars 2 Beta is a thing, no cross-play mentioned
• Zombie online game by MS, prob new State of Decay, could also be Dead Rising
• Anniversary update will gets its own landing page on Xbox.com with the major features listed, prob "available now" at E3 for preview

The trailer, uploaded here from another user, shows next to nothing. It only serves to promote the Xbox Media Briefing for E3. E3 2016 begins June 14, with various media events from Microsoft, Sony, Bethesda, and EA taking place beforehand.