Oh well... what we have here. I seriously don't understand. What is the "thing" Canon is suppose to be fixing with the 1Dx cameras?
1) If the problem with the 1Dx was purely a mass production problem, these camera we see in the box would be the final cameras and not pre-production models.
2) If it was a simple firmware only issue, they would release it anyway because a lot of people have already used them without major prod... And fix the small software problem via a patch, later.
3) If there was anything seriously wrong with the pre-prod cams, they would never send some to pro photog for Olympics and Euro 2012. Anyway, what pro photog would trust a camera on the job if they know the 1Dx have serious flaw.
4) That leaves only one thing in my mind... They are not fixing something nor having production problem. They are changing or upgrading something in the hardware, not software.
What is it? I dunno. Could be something minor like bigger memory buffer or it could be something major like f/8 support, red AF point in AI servo, etc... Your guess is as good as mine...
In any case, waiting sucks...