With the latest version of iBooks for Apple's iOS7 comes the total disappearance of the 'look of the book'. No more pseudo leather look cover or page edges; no more shaded spine, nor even the wooden bookcase for your library.
Apple's decision to do this falls in to line with the re-design of iOS - making for a much simpler (minimalist - you might say) look and feel. Much of the shine and shadows on any icons and objects has gone.
When it comes to the iBooks app, there are some issues that need addressing and I am disappointed that publishers have lost some element of control. Strange things happen when you compare re-flowable with fixed layout though!