Xbox One owners will find a surprise when they turn on their Xbox One's today as Microsoft has pushed out the September dashboard release a few days ahead of schedule.
This is a pretty solid release for the Xbox One as you're getting the new media player app (which will allow you to watch MKV and other supported files on local storage devices), a massive update to the party system, updates to the SmartGlass application, and the ability to go straight to the TV app when you fire up your Xbox One.
Here's Major Nelson with the full scoop: