KDE developers announced with Plasma 6.8 it will be Wayland-exclusive in removing Plasma X11 session support although continuing to support X11 apps/games via XWayland.
KDE developers report that "the vast majority of our users are already using the Wayland session" and longer-term this change will allow for new features, optimizations, and more development speed with foregoing X11 session support.
With the Plasma release timing, this means Plasma X11 session support will remain supported into early 2027 with the Plasma 6.7 series. The Plasma 6.7 release may end up seeing some extra bug-fix releases for X11 holdouts.
More details on Plasma 6.8 going Wayland-exclusive and other details via the KDE.org blog.
