Qt5 now works on Wayland - and KDE has a release coming up (the dev code already works on Wayland)
Note that Mir requires the exact same stuff. Just that nobody posted a patch to add such support. It is all distro specific.
As for me, I'm waiting for a hypothetical WLMonad.
1: http://blog.martin-graesslin.com/blog/2013/05/mir-in-kubuntu...
Qt5 now works on Wayland - and KDE has a release coming up (the dev code already works on Wayland)