I don't thinks so. I think it is first come first serve basis. But, I don't think they will reach capacity on one day of reservations. Park capacity even at 30% is huge so I imagine they won't even hit that on park opening. Not many people want to splurge full price on a limited vacation experience. So, far on all the boards I have read, people are opting to wait and see or modify reservations for next year. I am not too worried about Monday. I think a lot of people will try to book because its like with the toilet paper shortage. People want to get what everyone else is trying to get. Then when the novelty wears off they won't see the urgency and will cancel or modify until next year.