iOS7 Music Playback Controls
In iOS6, when you are at the lock screen, you can double tap the home button to get access to the music playback controls.
In iOS7, that feature doesn't seem to work anymore as the music playback controls are integrated with the control center, and if I want to disable control center access from the lock screen, I lose access to the music playback controls too. It's all or nothing.
With some security issues related to the direct access to certain controls on the control center, maybe Apple should redesign the control center, or provide a more granular control on what you want to be on there (eg. music playback controls, but not Airdrop/airplane mode).