14 DAY TRIAL // It's been a long time coming, but Canonical has officially confirmed that it won't be supporting the new Nexus 5 devices, at least not yet.
Google released Nexus 5 a few months ago and users have been asking constantly if Canonical is willing to officially support the new device. In short, the answer is no, the long response is not yet.
“Ubuntu Engineering (UE) will _continue to focus on the Nexus 4 phone platform_ and will _not adopt the new Nexus 5 platform_ short term (before 14.04 is out),” said Alexander Sack, the engineering director for the Ubuntu Core team.
“We decided against moving to the latest Nexus phone, because the switching costs were simply too high taking our current engineering goals/agenda/needs for 14.04 into account,” also said Alexander Sack.
As you can clearly see, Canonical didn't entirely dismiss the possibly to support Nexus 5, but the company is not willing to invest the resources in this Ubuntu 14.04 LTS development cycle. The developers might decide otherwise after the release of Ubuntu 14.04 (Trusty Tahr) in April.