When writing earlier about Canonical losing a top Compiz contributor, Sam Spilsbury mentioned on his blog he ported XBMC to Wayland. The work happened at the end of February.
Spilsbury ported XBMC to Wayland with changes to XBMC itself and the SDL library, details in this blog post. "XBMC Media Center has always been a favorite application of mine, because of its extensive customizability and versatility, being ported to many different platforms. I am pushing some proof-of-concept code today for something I’ve been working on over the past few days to add one more to the mix – support for the wayland compositor infrastructure.
Unfortunately, the code isn't quite ready yet for merging. "Again, this is more or less proof of concept work. The code is a little messy, and I have some open questions about how the backend should be implemented, considering that there are only two or three lines of wayland specific code inside of xbmc (the rest is effectively an SDL “window system” backend)."