Have you scratched your head wondering why Apple would put audiobooks in iOS' music player, rather than... y'know, a book app? So has Apple. Besides a redesigned music app, the early iOS 8.4 beta also moves audiobooks into iBooks, where they arguably should have been all along. You'll also get must-have playback features like chapter selection and a sleep timer. It's not certain when 8.4 will be ready for the public (WWDC, perhaps?), but it's already obvious that this is much more than a simple bug fix.