When I went Wednesday I asked someone there, and he said they don't let out 'till the front gate opens, I also think it is meant as a S&S for Halloween.
Finn's get both ST and Poltergeist, though it seems there are two waves in which they let you out, I was waiting by Monster Cafe hoping they'd let you there for ST, but then I saw a wave of people pass, rush to the side between Finn's and the park/smoking area but barriers were still up, so obviously the waiting area is divided where they let one part out before the other, the second wave was let out just as all the others had passed. Not sure where the first wave was let out, I imagine the street where the exit of Finn's is. Can anyone verify?