Later today Xbox One owners will be getting a system update. This update prepares for game streaming to Windows 10 (launching July 29th) and our upcoming Backward Compatibility feature launching in a few months. There are no new user-facing features in this release as the team focuses on the New Xbox One Experience that will be available later this year.
So there is nothing to see here really in this update. But Microsoft are laying the land fro Windows 10 streaming and upcoming Backwards Compatibility features. What these new features are is a mystery though. Maybe they have a lot of new games being added? Only time will tell.