Mir 0.14 had been in development since May as a big feature release. Mir 0.14 is already found in the Ubuntu 15.10 "Wily Werewolf" archive while it's soon going to land for Ubuntu 15.04 Vivid users.

Canonical's Cemil Azizoglu describes the Mir 0.14 update as, "It was a comprehensive release where we broke every single ABI under the sun including the client ABI. That required us to release many dependent projects."

Among the changes in Mir 0.14 are prep work on new buffer semantics, MirEvent-2.0 changes, a new surface input dispatcher to replace Android's input dispatcher, prep work for Mir-On-X11 to split the Mesa platform in common and KMS parts, G++5 compilation support, and various bug-fixes.

Those wishing to learn more about the changes in Mir 0.14 can find a new posting about it via unity.ubuntu.com. Meanwhile, Mir 0.15 is supposed to have support for Application-Not-Responding handling, raw input event support, experimental Mir support on X11, latency reduction optimizations, support for relative pointer motion events, improved window management support, libinput support, and other changes.