Microsoft has released a new build of Windows 10, 15031, to Insiders and there are a couple of new features in this release. This release is only for desktop users and there is no word on when this will come to mobile.
Microsoft is calling its new Picture-in-Picture feature a compact overlay which allows you to continue to watch a movie or video chat while working on other content. When an app enters compact overlay mode, it will be shown above all other windows and will not get blocked; the first apps to take advantage of this feature will be Skype Preview and Movies & TV.
Dynamic lock, a feature that had shown up in previous builds is now functioning. This feature will lock your Windows 10 PC when you are not around the device by using Bluetooth as the proximity detector; your PC will lock after 30 seconds of you being out of range.
Other small changes include a new share icon and Windows Game bar now supports 52 additional games. You can read about all the changes (and the issues with this release), here; as always, if you run into any issues, make sure to let us know.