At BUILD we demonstrated an early version of this work, running a few GUI sample apps directly from WSL such as
Eye of Gnome,
gedit and the
mpv media player. These apps connected to a wayland server running inside of WSL, which communicated with a RDP client on the Windows host. You can see a screenshot of this in action below where we’re running the GNOME file manager in WSL and Outlook side by side.
Link: The Windows Subsystem for Linux BUILD 2020 Summary