Over the weekend, Martin penned Mir in Kubuntu where he further describes the issues and frustrations with Mir.
Martin concluded his latest Mir blog post with, "I’m not really optimistic that it will still be possible to provide the Ubuntu flavors once the transition to Mir is done. I don’t think that Canonical has any interest in the community provided distributions on top of Ubuntu any more. There are many small changes in the direction which indicate that. But we will see, maybe I’m too pessimistic."