It isn’t clear what’s included in this update just yet, but it likely contains a number of bug fixes that should make the Windows 10 Mobile experience a little smoother. If and when Microsoft provides a list of what’s new in the build, we’ll update this post with more information.
It’s worth noting that, in addition to tips about the update arriving on unlocked phones, we’ve also seen it arrive on our AT&T Lumia 950. In any case, if you aren’t enrolled in the Windows Insider program, you should see the update arrive soon.
Update: According to Microsoft’s support page, this update has the same list of changes as the 14393.187 update that recently made its way to Windows Insiders on the Slow and Release Preview rings. Here are the details (note that only a few changes refer specifically to Mobile):
Improved reliability of Windows Shell, map apps, Internet Explorer 11, and Microsoft Edge.
Addressed issue causing push-button reset to not work correctly and roll back on devices with language set to any of the Unicode languages.
Addressed issue causing devices to crash after disconnecting an e-reader that was attached to the device.
Addressed issue causing devices to not recognize a Secure Digital (SD) card if it is inserted and removed multiple times.
Addressed issue causing some apps to not respond to the commands in the app bar in Windows 10 Mobile.
Addressed issue that sometimes blocks alarm notifications in Windows 10 Mobile.
Improved support for using the camera app in Windows 10 Mobile Enterprise.
Addressed additional issues with rendering 4K resolution, missing Start menu tiles when running on battery, Internet Explorer 11, Microsoft Edge, Bluetooth compatibility, graphics, display rotation, app compatibility, Wi-Fi, Feedback Hub, Miracast, Windows Shell, revised daylight saving time, and USB.
Security updates to Microsoft Edge, Internet Explorer 11, Microsoft Graphics Component, Windows kernel, and Adobe Flash Player.
Source : WindowsCentral