I found this in my inbox a little while ago:
PulseAudio 2.0 was recently released, and the audio team would like to get this into quantal at some point, but before we do, some testing is required to make sure things don't massively break. We don't believe they will, but its better to be sure.
PulseAudio 2.0 packages are available in the Ubuntu Audio dev PPA, https://launchpad.net/~ubuntu-audio-dev/+archive for quantal and precise. Precise packages are also available to help get increased testing coverage, as I am sure many of you are not yet running quantal.
If you find any regressions with PulseAudio 2.0, please file a bug against pulseaudio in launchpad, and clearly state in the bug subject that you are testing PulseAudio 2.0. Please also state whether you are running quantal or precise, just in case the bug is reproduceable on one, but not the other.
All being well, PulseAudio 2.0 will be uploaded to Quantal at the end of May, in time for alpha 1.
Thanks in advance.