Yeah this is very unfortunate for me, personally. I have a Nexus 4 and a Nexus 7 (2013 model) and I'd love to try this out, but the Nexus 4 is my day-to-day phone and it would be terribly inconvenient to monkey with it so much just to try out an early Ubuntu release. The Nexus 7 is more of a toy and I'd be willing to try it out, but they still don't support the newer model of it.