Edit: Nevermind, found one myself:
https://www.youtube.com/watch?v=-ri7TmPeqLc
An internal binary leaked a while ago, someone confirmed the WebView2 aspect: https://twitter.com/teroalhonen/status/1346196838840463360
Edit: Nevermind, found one myself:
https://www.youtube.com/watch?v=-ri7TmPeqLc