Canonical has been working on the Mir display server for some time, although most of their efforts have been made towards the mobile platform. They are now looking to optimize it for desktop use and nothing reflects the progress made more than a famous game running on Mir.
Mir is already working on the desktop, but users need to have the open source video drivers in order to make it work. Canonical has recently built a new flavor called Ubuntu Next which features Unity 8 and the Mir display server. The new desktop environment needs Mir, so it stands to reason that the updated DE will arrive for regular users when Mir is also ready. It’s not there yet, but it’s taking great strides.
Submitted by: Silviu Stahie