Does anyone else think that the iBooks app in Mavericks could hold some clues to a slightly updated OS X UI? Some parts of the app look different to the usual OS X UI, and more like iOS 7 - such as the sidebar and loading graphics. Things like the tab bar just look like some older versions of OS X, which doesn't really make sense... The fact that the icon (and all new Mavericks icons) is very flat (less shine, less skeuomorphism) could also indicate that Apple may redesign the OS X icons to become flatter at some point. Does anyone else think that this could be the start of the iOS 7 UI being partly transferred over to OS X, or is it just the OS X UI becoming fragmented?