Comment 1 for bug 179660

I too am frequently frustrated with the lack of bleeding-edge versions in the most current release of Ubuntu. However, there are good reasons for not constantly upgrading packages for a particular distribution. For one, the effort required to closely track upstream, provide packages for all releases of Ubuntu, and handle bug reports would be enormous. In addition, changing versions outside the normal development cycle would increase the likelihood of introducing critical bugs. Restricting package updates to the development version of Ubuntu keeps critical bugs introduced by new versions from affecting the average user who doesn't need the bleeding-edge version.

Fortunately, there's usually a way to get the most bleeding-edge version of a package: prevu. This handy little program makes it relatively easy to backport packages from the development version of Ubuntu to the current release. See https://wiki.ubuntu.com/Prevu and http://ubuntuforums.org/showthread.php?t=268687 for more details.