Over the past few weeks, new distributions have been added on apt.postgresql.org: Ubuntu 13.10 codenamed "saucy" and the upcoming Ubuntu LTS release 14.04 codenamed "trusty".
Adding non-LTS releases for the benefit of developers using PostgreSQL on their notebooks and desktop machines has been a frequently requested item since we created the repository. I had some qualms about targeting a new Ubuntu release every 6 months, but with having automated more and more parts of the repository infrastructure, and the bootstrapping process now being painless, the distributions are now available for use. Technically, trusty started as empty, so it hasn't all packages yet, but of course all the PostgreSQL server packages are there, along with pgAdmin. Saucy started as a copy of precise (12.04) so it has all packages. Not all packages have been rebuilt for saucy, but the precise packages included (you can tell by the version number ending in .pgdg12.4+12 or .pgdg13.10+1) will work, unless apt complains about dependency problems. I have rebuilt the packages needing it I was aware about (most notably the postgresql-plperl packages) - if you spot problems, please let us know on the mailing list.
Needless to say, last week's PostgreSQL server updates are already included in the repository.