Annual Passholder Previews for Journey of Water, Inspired by Moana will take place September 24-29 and October 1-4. Unlike recent Annual Passholder Previews, you do not need to sign up to visit. You do need to make a Disney Park Pass Reservation for Epcot. You cannot show up after 2:00 and expect to be allowed in if you didn’t make a theme park reservation.
Here are parts one, two, three, and four.