The following information below is from the Joomla! 3.0 Introduction site.
Joomla! takes a big leap into the mobile space with a total overhaul of both its frontend design and administrator interface. With the adoption of the Bootstrap framework, Joomla! has become the first major CMS to be mobile ready in both the visitors and administrator areas. Now every website can have mobile friendly content for visitors and mobile friendly tools for administrators.
Joomla administration has a brand new look and feel, built with the power of Bootstrap responsive framework, along with a touch of the awesome UI/UX work of the Joomla JUX team. Joomla comes ready to go and fully responsive for mobile devices, tablets, and normal computer screens. The entire backend of Joomla has a brand new look and feel that will improve your workflow with any type of device.
Spend less time coding and building interfaces with Joomla 3. The Joomla User Interface (JUI) library gives you a standardized backend & frontend interface. LESS CSS and jQuery means you can write less code and the Icomoon font icon library provides a wealth of retina-optimized icons.
Joomla 3.0 is a whole new exciting world. We took a little from the top, bottom, and side to create a whole brand new look and feel, along with many features under the hood features that bring Joomla to the forefront of the content management system world.
Test drive the demo site of Joomla! 3.0. Username: demo - Password: demo