It has arrived, a little over a month from the last beta release, is MariaDB 5.3.1. It is a bug-fix update and as always the changelog lists everything that has been fixed. The release notes list all the changes present in the 5.3-series.
Many fixes are in the optimizer updates that showed itself in MariaDB 5.3.0-beta, plus backports from the MySQL 5.6 feature preview trees. Microsoft Windows is also important to the MariaDB project so there are plenty of updates for that platform. What are you waiting for, download it now.