According to Jensen Harris, the Office 2007 User Interface has been updated and can be previewed by visiting the Office 2007 UI Preview Site. One of the nice things is the introduction of the Office Button. I feel that this will help make troubleshooting problems much easier. The new interface also showcases the ability to customize the look and feel of Office 2007 by way of themes and perhaps most significant in this update is the overall face lift given to the Contextual Tabs. Jensen Harris’ blog is a great read for anyone interested in usability studies and the design choices made in Office 2007.
Office 2007 User Interface