I see that October reservations are open today. I called at 1230 EST and the 3 days I could do it were booked solid. Not even a day and poof, they were all taken up.
I don't think they are actually booked solid. I think there is an issue with the reservation system. I called as well and they said it looked strange as the entire month of October was unavailable. They just extended the park hours and set the times, there must be a delay on the booking. I checked two different nights at Tiffins and there were plenty of regular reservations, just not ROL.