So as of now, the communication from Disney is that they will begin selling tickets for 2020 sometime "later this summer". Not reassuring for anyone who had plans through the end of August, but my thought is that they will release ticket sales for 2020 once they feel confident that most people who planned to use existing tickets in 2020 will have already booked their park reservations. They had to allow those with tickets to book first, and then determine how much availability they had to still stay within capacity limits. Tomorrow, annual passholders without resort stays can book park reservations. Then Sunday, ticketholders without resort reservations can book their reservations. I think before the end of next week we may have a better idea of if/when 2020 tickets will go back up for sale.