WordPress 3.3 introduces some very interesting features, specially for the blogger itself. It includes a new drag-and-drop uploader, hover menus for the navigation, a new toolbar, improved co-editing support, and a new Tumblr importer.
The admin interface has add a great cleanup too.
More information on the official release notes : http://wordpress.org/news/2011/12/sonny/
I already updated the blog to Wordpress 3.3 and it looks great for now. For the first time, I didn't have to disable all the addons prior to updating. This time it worked directly :)