Sorry, only just saw this and I've already switched back to my 'normal' setup (based on emacs 27.1). 

I did find a couple of minor 'quirks', but don't know if they might not have just been minor issues in current head anyway. 

I did have to start the pgtk image with --no-x-resources switch to prevent it from segfaulting. 

It doesn't look a lot different than normal Emacs. Those with more of an eye for the subtle aesthetics might notice more. I did notice that the fonts sizes were larger i.e. same font specification gave slightly larger fonts. Also noticed that on a couple of occasions, initial layout for something complex was a bit 'jumpy'. For example, I tried running spacemacs (which worked quite well) and the initial spash screen was all out of alignment initially (at the end of loading it re-aligned and was fine). 

So, probably not quite ready for day to day use, but still pretty good and likely to be a real bonus for those running under Wayland who would like to get rid of the X layer completely. Emacs was one of the 2 reasons I stopped running Wauyland and switched back to X - the other being I was also running stumpwm (part of a little experiment I was doing where I was trying to make as much of my environment  on tools based on a lisp/functional approach as possible (stumpwm, emacs, nyxt, rep, guile, clojure, clojurescirpt etc). 

Tim