Build 20279 is now available in the Dev Channel. It's the last fe_release build Insiders will need to test. It has no fixes or changes, just known issues. Microsoft has released a new build to Insiders in the Dev Channel this week, and it's likely to be the last from the "Iron" fe_release branch that has had very little in it in the last few weeks. For those unaware, "Iron" is the codename for the 21H1 release of Windows, but it won't be coming to Windows 10 desktop. It's a release for Windows 10X and Windows Server 2021 only. That's why the fe_release builds have essentially had nothing in them, because all the work going on for Windows 10 Iron releases is happening on entirely different versions of the OS. Microsoft is finalizing Windows 10X (and ultimately, the Iron codebase) with build 20279, so they've been pumping out bug fixes and changes big time internally, but none of that really translates to the desktop builds.