.....uhhhhhh.....I don't know..........my DS is there now - he just sent them to me a little while ago. [He has an AP]....The parks actually open June 5, but since he has an AP, he was allowed to make a reservation for today. He said that there wasn't really any long wait times - maybe 20 minutes at most. Also, you may not park-hop.
He actually WAS able to go to the other park after all....you had to reserve a virtual pass, but since it was down, they let him[and anyone] ride the Hogwarts Express to go to IoA. (they were originally at US.)