Many of you will have seen the recent news about Mir coming to Ubuntu 13.10 in October 2013. For those of you who are unaware of Mir, it is an Open Source display server we are building that we will use across desktops, phones, tablets, and TV. It currently works with Open Source drivers and we are currently in discussions with the major GPU manufacturers to discuss Mir support in their proprietary drivers.
FMost recently, we reached out to Phoronix to ask if Michael could perform some benchmarking tests on Mir to see where things stand today with applications running on XMir on Mir. Now, bear in mind that Mir has not yet been through a round of performance optimizations (this will happen a little later in the cycle), and the results naturally have a performance impact because of this, but the impact was not too great. These performance regressions should be largely resolved before Ubuntu 13.10.
full post 
Also: The Lubuntu Blog today reported that Lubuntu would be using XMir, but removed the post before I could link to it. Don't know what that means. The only other part I recall was that they were testing it now.