14393.3 Windows 10 Mobile build is here for the windows insiders in fast ring. Here is what has been fixed in this build. It shall be noted that there is no more difference between 14390 and 14393 than between 14393 and 14393.3.
Changelog for windows 10 x86
* Fixed an issue where keyboard input on some Windows tablet devices would not rotate to landscape normally.
* Fixed an issue that results in Windows Updates being delayed on systems with Connected Standby.
* Fixed a problem with text input with Korean Input Method Editor (IME) in some Store apps.
* Fixed an issue with apps that synchronize using DDE for inter-process communication.
Changelog for windows 10 mobile
* Fixed an issue causing Store apps to stop launching due to a licensing issue.
This build would not show up for the release preview or slow ring windows insiders. To get hold of one, you must be a windows insiders and enrolled in fast ring windows updates.