Recently announced was the release of the excellent Joomla 3.1. Joomla 3 was the latest major release of the Joomla CMS, with Joomla 3.1 the second minor release in this series. Upgrading from Joomla 3.0 to 3.1 is a one-click upgrade with backward compatibility. If you're running a Joomla 3.0 site, simply use the one-click upgrade to get the new features and the latest bugs fixes for 3.1.
All Joomla51 templates currently available Joomla 3.0 are also fully compatible for Joomla 3.1. If you are currently running Joomla 3.0 using a Joomla51 template you can upgrade to Joomla 3.1 without any need to for an update to your template.