14 DAY TRIAL // Canonical is still on track with the development of Ubuntu 13.10 (Saucy Salamander) and the team has just uploaded in the main repositories all the necessary XMir components.
The Mir displayer server will be implemented in the next Ubuntu version, 13.10 (Saucy Salamander) and the team has only a couple of months to get the job done.
“In recent days Mir and the relevant X.org patches required to support XMir have landed in main. The final component needed for turning on XMir is the unity-system-compositor (...or as we prefer to shorten it, u-s-c).”
“We had recently been performing a variety of integration tests across a spectrum of hardware and we now feel confident about pushing u-s-c into universe,” stated Canonical’s Kevin Gunn, the leader of the Display Server team.
XMir is an implementation of X running on Mir. It's designed to work as a buffer for the developers who don't want to go straight to Mir.