When I first read that the Control Centre could be accessed from a locked phone and used to turn on Airplane Mode – thus rendering Find my iPhone useless – I had a panic and turned this feature off ASAP. I then missed it, so thought what the possible impact was.
My understanding is that the new iOS7 means that the phone cannot be reset without the iCloud credentials. If my phone fell into the wrong hands and they turned on Airplane Mode, the thief would be left with a phone they are unable to reset to use themselves or flog. They can’t get into it either, assuming I have a passcode on it that they don’t crack. OK, so I’ve lost a phone but – in theory – I’ve lost no valuable or sensitive data.
As soon as they turn wireless on or airplane mode off (i discovered today that Airplane mode can be used with wireless and Bluetooth on) I can use Find my iPhone to wipe the data.
In summary, I reckon the risks of having Control Centre accessible from the lock screen are minimal.