Apple has made something like a....passion from patents. The last thing they want to do is to implement a technology which can detect if your phone has been stolen. This technology should help you in case if your device was stolen by notifying you about this situation and allowing you to remotely find it. However, the situation can stay a little bit different in practice, because Apple might be able to audiovisual spy you, by detecting if somebody with a different voice or face is using the device, and shutting down the device remotely.
But what's really worse, the technology should allow Apple to identify if the device has been jailbroken and unlocked, so they might have the possibility to kill the device remotely. A line in the patent also mentions that cellular carriers could shut down or cripple the device, if it is detected as jailbroken.
That's a good news for the retail, but for the customers, it is definitely something unacceptable.
You can read more on Engadget.