It’s an experiment in building a graphical desktop system on top of Ubuntu Core. I generally tag updates about it as an “experiment” because most effort has been centred around working out what’s possible rather than having a fixed end goal. Most of the effort so far has been on getting a graphical login (the “GDM” part), and being able to launch a strict confined desktop session from there.
I’m not sure that there’s much new that you’d see from a video: if you’ve seen the default Ubuntu 20.04 desktop session and the
gnome-initial-setup first boot experience, then that’s basically what you’d see. There is still a lot of work to do before you could use this system to do real work. In particular, graphical snaps can’t yet connect to the Wayland server running in the confined desktop session, and we don’t have slot-side implementations for a number of the “implicit on classic” interfaces those snaps rely on.