With the October 2018 Update of Windows 10 Microsoft introduced many new features to Windows Mixed Reality including SteamVR integration and flashlight. Now that the October 2018 Update is done Microsoft are working on the 19H1 update of Windows 10 and they are starting to introduce new features for Windows Mixed Reality.
The first visible change is a new look start menu. The new menu has a curved card based look with fluent design and space for a user picture (not implemented yet). The places button is a bit off at the moment so Microsoft have more to do with the design before it’s finished. I hope that this is just the start of the UI work in Windows Mixed Reality.
Here is the old design:
Hear is the new design: