Have you noticed that the 7 Dwarfs are coming out earlier than their scheduled 7pm appearance?
Great question - and are they in the same location as they were last year? I need to know where to line up
Kenny the Pirate has all the info you could want about characters. Here's the page about MNSSHP: http://www.kennythepirate.com/2012/09/13/mickeys-not-so-scary-halloween-party-characters/
His Character Locator app has the specific answer you want, but that's for paid subscribers, and I was warned in no uncertain terms about posting info from there elsewhere. (I will say that the subscription is worth the $5 or whatever you pay for a year, if you want detailed info about characters. You can see when and where you can find a character, updated weekly.)
I saw a trip report from someone on chat that talked about what times Sally and Jack and 7 dwarfs came out. I will look on chat to see if I can find it.