Reservations were open to book after the announcement. I was watching the task force meeting with my reservation page open. When they announced the date, I went to my reservations and started looking at extending or changing my dates. Our check out day was July 11. lol How much luck do I have??? At any rate, I looked around and played with dates until the meeting was near over. I could have easily modified or made a new reservation. I'm not sure when they actually locked down reservations, but I was playing with mine until at least the end of the meeting with no problems. Ultimately, I chose not to modify, but the point is, I could have.
That said, who knows how it would've turned out had I made any changes. It would appear they are prioritizing resort guests for entry and it may well be date based. I would've been good with my original dates as they were booked many months ago, but those who just added are probably way down the line and may end up not getting reservations to the parks. It's all muddled right now as it has been for months, but I'd be worried if I just booked for July yesterday