Any word on whether this has fixed the music playback bug?
I don't know if this is an iPhone 5S only bug or if it is affecting other devices, but there is a bug where if you are playing music and unlock your phone, the music spontaneously skips back to where it was the last time you unlocked your phone. Infuriating, and also something that I would think should be very easy to fix.
I've never had that bug, and I use the music app for about 8 hours straight a day, occasionally unlocking to check twitter.