Does Qt support ribbon control?
One of their sample apps apparently has a ribbon, so it should be do-able.
http://qt.nokia.com/images/products/vtk-designer-opengl-screenshot
You can take any JavaScript/JQuery ribbon, insert it into QWebView and do whatever you want with it, using the Qt Webkit Bridge.
While there is no dedicated Ribbon widget in Qt, you can fashion something similar yourself. You could take a QTabWidget and put some buttons inside (and optionally style it to look a bit more like Microsoft's Ribbon). Depending on what you're trying to accomplish, that might suffice.
I want to share with you the link to site has published screenshots of their component Qtitan Ribbon for Qt. http://www.devmachines.com/qtitanribbon-overview.html
There is no Qt ribbon control. I believe there are license issues preventing Nokia from developing a ribbon control that is similar to Microsofts.
No, it doesn't. I didn't find out any plan to support it in the future.