Bold Redesign Improves Office 2007: These interface changes should go over nicely.
In Word, Excel and PowerPoint, all of the menus are gone — every one. None of the familiar toolbars have survived, either. In their place is a wide, tabbed band of icons at the top of the screen called the Ribbon. And there is no option to go back to the classic interface.
Via Allison Gunn who says:
[If this] is even sort of accurate, forget it. I won’t use it and you can’t make me. WordPerfect died for lesser crimes than these.