What iTunes 11 says about the future of Apples UI design.
-Brighter more modern design UI.
-Usability over sexyness (coverflow)
-Re-redesigned music app for iPads. (much needed)
-return to color icons in side bars (yay!)
-bolder font in side bar
-revised plus and gear symbols in the lower left of the status bar
Many times over the history of OS X, iTunes was used to debut new UI changes coming up in the next OS X release. I suspect these designs are a preview to 10.9 UI redesign.