Some of the japanese tranlations hinted at a tool kick to customize the UI's. SO they will restrict certain things, but the abiltiy to theme, and create your customixed look (as long as it causes no advantage over others) will probably be added.

Be nice to have a wheel you can customize, color, add effects. Or a menu system. Done right, I would like to make a Windows Kinect interface for hand gestures to change things. Did that with another game and worked well.