Welcome to my latest hands on Windows Insider build video. This is build 17115 of Windows 10 Redstone 4 for Windows Insiders on the fast ring.
There are no known issues with this build, which is a good sign, this close to the release of Redstone 4. The build fixed the problems with the Microsoft Store and the issues with Windows Mixed Reality. In this video, I take a look at the fixes. Full release notes here.