https://www.bleepingcomputer.com/news/microsoft/windows-10-insider-build-17723-redstone-5-and-build-18204-redstone-6-released-heres-whats-new/

Today Microsoft released Windows 10 Insider Preview Build 17723 (Redstone 5) to insiders in the fast ring and Redstone 6 19H1 Build 18204 to insiders in the skip ahead rings. This is the first Redstone 6 19H1 build released to insiders, but for the most part resolves the same bugs and adds the same features as the Redstone 5 build released today.

Both of these builds come with a new Mixed Reality Flashlight feature, improvements to Microsoft Edge, the introduction of Emoji 11, improvements to time functions, improvements to kiosk mode, and an improved update experience.