Ubuntu 17.04 comes with a wayland display server session. I've used and seen what it can do, I've used it before by selecting it from the lock screen just like selecting Unity 8 session, with a gear icon, that option doesn't appear in Kubuntu's lock screen. A blatant explanation would be that Kubuntu doesn't ship with wayland display server but it comes with an app exclusively called as wayland
The app itself does nothing that or I can't seem to understand how to use it and make wayland session possible
I'm sure that I'm not running Wayland, but I've seen videos of KDE Neon running Wayland, is it just not possible in Kubuntu?