The Samba package has been rebased to the upstream version 3.0.33. The 3.0.x version series is a bugfix only branch of the samba code base. By rebasing to 3.0.33 we will include a number of important bug fixes and security fixes. No new features will be added by this rebase.
For more information on the upstream fixes provided by this rebase, refer to the Samba Release Notes: http://samba.org/samba/history/samba-3.0.33.html