For whom are running Joomla! 3.2 on a server with PHP 5.3.10 or later, it's encouraged to update immediately to Joomla! 3.3 and for sites on servers with a version of PHP less than 5.3.10, 3.2.4 is suitable for you. Please download neccessary package for your website here.
As said before, the 3.3 release introduces new features into the CMS such as improved password hashing and microdata and optimizes the code with performance improvements to the routing system and the continued conversion of MooTools based JavaScript to jQuery. You can find detailed features in another post of us by click here.
And don't forget to follow 2 topics about Joomla 3.3 Templates and Joomla 3.3 Extensions Collection to get the latest upgrades on our products from us. Thanks for reading and hope this helps!