As you may know, Canonical has recently made GCC 5 the default compiler on Ubuntu Touch, the mobile version of Ubuntu.
For now, everyone is busy with the GCC-5 transition because the Wily-proposed image of Ubuntu Touch is broken right now, but the issues should be fixed soon.
As a reminder, Canonical updates its Ubuntu Touch monthly. With the Ubuntu Touch OTA-5 Update released, OTA-6 is under development right now and should be released on the 11th of August, 2015.
As you may already know, the first Ubuntu Touch phones are BQ Aquaris E4.5, BQ Aquaris E5 HD and Meizu MX4, but the system is also officially supported on the LG Nexus 4.