here's a thought. What if they didn't actually change the dock connector for the final product, maybe they released this prototype with a unique proprietary connector in the case that one of the prototypes finds its way to the public (as iPhone prototypes are wont to do) and that way someone who finds one can't boot it up, much like the gentleman in the video is finding? I wouldn't put it past Apple, it actually is a very elegant solution to a problem they're faced over the last few iterations of their phone. It seems unlikely all the accessories made for iPods and iPhones and iPads would be cast aside at this point in time. That might also explain why the phone required iTunes. Maybe they built in a software lock that requires iTunes connection to enable iOS to boot as a safety precaution, knowing that the cables won't be available.