On FB Fun Spot has stated the park and AF1 opens to the public at 4pm that day. They have also said there will be passholder ride times but they are not ready to release that info yet. Many people assume it'll be earlier in the day before official open, but who knows at this point. I would guess media first, passholders second, open to public at 4.
I keep thinking after it opens it will be easy to marathon this thing if you can get there on a weekday. Will be really interesting to see how the wait times and crowds end up. It's such a small park.