https://www.bleepingcomputer.com/news/microsoft/windows-10-insider-build-17713-is-now-available-here-s-whats-new/

Microsoft has just released Windows 10 Insider Preview Build 17713 (Redstone 5) to the Insiders in the Fast Ring. The preview build introduces new features for Microsoft Edge, improves Notepad, and more. As compared to the previous builds, this new build doesn’t come with a large number of improvements.

Microsoft also announced that Redstone 5, which are the current insider builds that we have been playing with, is being forked into its own branch called "RS5_RELEASE". This branch will be used to stabilize the current feature set, remove any existing bugs, and get it ready for release.