I'm on hold. 30 min wait was mentioned on the phone. Now a message was just announced that they can not make ANY modifications and will only be answering questions to stay on the phone if I would like to speak to a CM. Something about "waiting for the launch of their pass system." And as for website, it is changing before my eyes. I now have "My Itinerary" and "My Reservations and Tickets" listed under the My Disney Experience dropdown. I'm back to the castle or seven dwarfs when I click on anything though.
Edited to add: Now the message says that I should check online for updates on when the park pass system is active or call again later if I want to make a modification for the 2020 year. I can still hold to ask CM questions.