For what it's worth, here was the process this morning. IoA started letting guests into the park at about 7:45am, but only if they showed their on site room keys. Nothing was required to prove you had the HP package. We were allowed as far as Confisco's until 8am when everyone was escorted back to WWoHP. At the point we entered the area, we were told it that the area would only be open until 10am, at which point we would have to leave. Keep in mind, the only people allowed in at this point are people who specifically purchased a WWoHP package - and plenty of people were upset to learn this (including me).
With that said, it turned out we were able to experience everything there in the two hours allotted, which kind of surprised me. Then again, there wasn't a huge crowd there either, so that certainly helped.
I'm reserving full judgment on the area until I can spend some more time there. The theming is a amazing, lots of good reports on Forbidden Journey (the queue is like nothing I've ever seen before), but honestly - I'm not sure this is going to live up to the hype.
Pete