Microsoft today rolled out a new build for Windows 10 Fast Ring Insiders and it is supposed to be the first build for the new major release codenamed Redstone 3. The new update doesn’t bring any new features but includes bug fixes and has some backend changes to Windows 10.
Insiders on Fast Ring can download the update by going into Settings > Updates & Security and Checking for new updates. However, there are some known issues with this update. You can read further about the new changes and bugs in the latest release on the official post on here.