Ahhh.. seems most of the UI is pretty much the same. I like the new percent complete link on that shows up in the lower left of the screen when viewing the 'options' while reading a ebook that when clicked shows a small window with reading stats.. HOWEVER.. That link replaced the Home/Library/Search result link that was the most used feature for me. Not only did it save wear and tear on the physical button to go 'back' home or to the book list but by using it I could easily select which 5 books showed up on my home carousel. PLEASE BRING the 'back' link back...
