Kevin Cole at
Raspberry Pi 2 unveiled with faster processor and more memory - BBC News http://m.bbc.com/news/technology-31088908
And, as revealed on the Raspberry Pi web site, http://www.raspberrypi.org/downloads/ the Ubuntu Snappy Core http://developer.ubuntu.com/en/snappy/ image is also available.
And, of course, Firefox OS on a Raspberry Pi from our friends at Mozilla: https://wiki.mozilla.org/Fxos_on_RaspberryPi