Late yesterday night the latest version of WordPress (3.3) was released. As usual, it is available from the auto-updating feature built right into WordPress. We recommend everyone to upgrade right away as the new version contains important bug and security fixes. Other nice features include UI enhancements and developer enhancements which you can read more about here.
As usual make sure you backup at least your database (preferably your files too) before pushing the update button to be able to roll back if anything unexpected happens.