Hmm, yeah the "historic" could mean it's something big. Could also be anything since it's an 1880's theme park, lol. I seem to recall them hyping up a big announcement a few years ago that was a dud, but who knows. It would be a weird time to announce a new ride or even hint at one, but again if they want to let people know it's the last season...
Wonder if there's any chance it has to do with the resort/new property. Now THAT would be a historic announcement.