Microsoft released Windows 10 Insider Preview Build 17723 (Redstone 5) and Redstone 6 19H1 Build 18204 to insiders in the fast ring and the skip ahead rings. The latest builds come with a new Mixed Reality Flashlight feature, improvements to Microsoft Edge, the introduction of Emoji 11 and improvements to time functions. Microsoft added a new tool that allows you to peer into the real world using a camera attached to your controller to see what is happening without taking off your VR headset. Microsoft created new group policies that let you control the behavior of Microsoft Edge.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-insider-build-17723-redstone-5-and-build-18204-redstone-6-released-heres-whats-new/