UPDATE: Released on 21.10.2013
The iOS 7 version for the iPhone is now ready. Unfortunately it is not possible to make an iPhone-only update, I must also update the iPad version. This will take me another week or two.
Basically it is just a new look (you like it or you don't), but it is also a simplified user interface. All the functions are still there, but some in a more simplified manner. The playback control now only offers the shuffle and repeat modes, plus the speed control (+ or -), because you can now use the iOS' Control Centre to play/pause/skip, etc.