This morning I installed KDE Neon on my good old ExoPC as I need to test some touch functionality on Wayland. So here are the steps on how to switch Neon to use Wayland:
Install package plasma-workspace-wayland:
sudo apt install plasma-workspace-wayland
Log out and select in session drop down Plasma (Wayland), log in and enjoy your Wayland session.
If you want to verify that it truly is a Wayland session, just open any KDE application, open the “Help” Menu, go to “About <Application Name>”, click “Version” tab, it should say “The Wayland windowing system” is being used.