Does this mean they will also use the GitHub issues instead of bugzilla? I would very much welcome this.
Also, github is just a mirror. The main repo is on git.php.net where they are continuing to use their karma based everyone-commits-to-a-central-repo system (see http://git.php.net/?p=karma.git;a=summary). This goes together with the rest of the infrastructure that they continue to self-host