Windows Insiders gets the option to receive builds from the RS_PRERELEASE branch

In the earlier post about the Windows 10 Insider Preview Build 20246 release, we had seen starting with this build 20246, the name of the branch from which builds are released was changed to FE_RELEASE. Windows Insiders in Dev channel were getting builds from this branch.

And now Microsoft has released Windows 10 Insider Preview Build 20277 (FE_RELEASE) to Windows Insiders in the Dev Channel. Starting from this release, Windows Insiders in the Dev channel will also be getting the option to receive builds from the RS_PRERELEASE branch. These builds will be offered as an optional update in Windows Update. Insiders will have to go and choose to install the currently offered RS_PRERELEASE build. Once they do, they will continue to receive RS_PRERELEASE builds going forward.

So with the build 20277(FE_RELEASE), Microsoft  has also released Windows 10 Insider Preview Build 21277 (RS_PRERELEASE) to Windows Insiders in the Dev Channel. As said, it is offered as an optional update.

This optional experience for receiving RS_PRERELEASE builds is just temporary. Microsoft is planning to move all Insiders in the Dev Channel back to receiving builds from RS_PRERELEASE sometime after the holidays. Insiders who choose to stay put will continue to automatically get builds from the FE_RELEASE till all Insiders in the Dev channel will be moved to RS_PRERELEASE as said after the Holidays.

Please note that once an Insider chooses to install a RS_PRERELEASE build, they cannot move back to receiving FE_RELEASE builds as their device will be on a higher build number. Insiders will still have the option to roll back to a previous version for up to 10 days or until you take another build. 

(source)