The H reports
on a change in the Ubuntu 13.04 release process. There will not be any
13.04 alpha releases. "With there only being one beta and one final release of an Ubuntu version, the archive of code will now only be frozen late in the development cycle. This change could also allow for the introduction of Mark Shuttleworth's "Ta-da" features quite late in the development cycle, though currently it is unclear how they will be integrated into the tree; there could be a parallel testing effort for a version with those features included or if the features could be added earlier in the cycle to allow their testing to begin sooner."