OpenLogic CentOS 6.5 is out and available on the Windows Azure Gallery! Their repositories are updated as well so you can upgrade your current 6.3 images to the latest 6.5.
However, there is a quick step you need to take to update your running CentOS 6.3 image to 6.5. It involves editing the /etc/yum.conf file and removing some parameters that are no longer required. OpenLogic has posted instructions for this here - http://www.openlogic.com/azure/centos-63-to-65-on-windows-azure-update-instructions/
Hope this helps!