As you may know, Ubuntu MATE is the newest member of the Ubuntu family. In the below video, Martin Wimpress, the main MATE developer has demoed the MATE DE running on a Meizu MX4 smartphone with Ubuntu Touch.
The system uses MATE 1.8.2, LibreOffice, Caja and MATE Terminal, but the interface is not themed, due to the fact that XMir is not ready yet to support GTK+ themes.
The video was recorded by Reiner Klenk, who recorded the Ubuntu Phone with MATE with another Ubuntu phone.