So, while I was laughing derisively at the printer thing, a coworker informed me that this was an actual thing from the real world. I’m not even mad. That’s amazing. http://arstechnica.com/business/2011/…

It's more about the motion than where the gesture starts. You can start your swipe in the middle of the lock screen and as long as you swipe right-to-left, the camera will open. (That may have changed between the developer preview release and the final release though.)