Fairly accurate. Last year was about half and half, but 2017 had the entire lineup leaked in March, with one maze change very late in the game. There are some people who are plugged in and have sources within the HHN team or something.
Considering that both coasts are saying the same thing, I think it's pretty safe to say that the predicted lineup for this year is accurate (still to be announced: HoTC, Creepshow, Ghostbusters, Tram maze, and Klownz). That doesn't preclude something changing, of course, but we'd hear about that.