So, some interesting stuff is going on with park hours. Since the Sept park hours have been released, Wed the 19th and 26th have shown the park closing at 7pm. However, the hours have been updated in the past day or two and now show a park closing time of 5pm (a normal HHN closing time). Could this mean that we might be getting some extra days added to the event? Maybe ticket sales are higher than expected already because of the hype for this year so they added more? You can't currently purchase tickets for this night yet, but that's most likely because they haven't announced it yet. I for one will be VERY happy if they add on two dates and I hope they include it in the rush of fear ticket if you've already purchased it.
Also, if you go to the "Know before you go" section on the updated website and click Dates, it lists the 27th as an event night now which never was before. Either it's an error on that page, or they moved the event to the 25th which now has the park closing at 6pm.