No it isn't based upon the order the link is clicked.So it would seem the registration isn't random, rather, the order you click on the link. I clicked when the e-mail came in and got spot 457, but my other browser, which I opened at registration time, was number 5,2xx.
If you opened the browser a split second after 11am, it would have been placed at the rear of the queue. Even if that wasn't the case, it's still just random. I wouldn't suggest using posts from 2 or 3 people to draw conclusions.