I saw a picture over on the Orlando United forum some time this past week--the thread is so long over there, I didn't have any luck going back and trying to find it, sorry--but they were saying the picture was of the commemorative ticket.
The "ticket" was quite different than what I expected if that's what it really was. I thought it would look something like the invitation and tickets sent out to the travel buyers back before the big PowWow event for them, but in the photo I saw it was something you had to go and pick up in the park or Citywalk (they gave you a voucher for it when you arrived at your hotel) and it was a 3D holographic image of Harry on his broom. When you moved it his wand lit up. On the back it said something about the Grand Opening of WWoHP. This may not actually be it??? But it is the only mention of the commemorative tickets I've seen.