What Quarkslab’s research proves […] is that Apple’s iMessage back-end could be designed to allow for Apple to intercept and read message content, and there is no way we, as iMessage users, would be able to detect it.
What Apple has said, and reiterated today, is that iMessage’s back-end is not in fact designed in that way — that there is no mechanism in the system for Apple employees to surreptitiously change the encryption key to allow for messages to be decrypted during transit.
I don’t have much to add to this one, I just found the article to be interesting. I agree with Gruber that it would be a huge mistake for Apple to lie about something as sensitive as this. However, at the end of the day, which side does it make more sense for companies to side with? Users? That’s naive.