The Scare Zones will most likely not be as they previously have been. I'd say they will make the Scare Zones more of entire-land zones rather than a designated route which has been used in the past. It would make much more sense if this was the case, as over in Forbidden Valley there is limited space to use for Scare Zones which has an exit and an entrance, and the only ideal place is the Woodland Walk, however the exit for that would be at the Hotels meaning guests would have a nightmare getting back to the park, and also gaining entry again. AT did also visit PortAventura recently to look at how they run their shows and events, and PA have used whole-regions for their Scare Zones in the past, so the possibility of the scare zones for Scarefest 2015 being open-areas is quite high.
As for the Scare Mazes, Haunting of Molly Crowe will most likely be located in the place of The Sanctuary, with ToTT just taking a new route from it's existing rooms it previously used. However, saying that, photos of construction showed that the entrance stairs to ToTT were fenced and bolted off (top of the wooden stairs), suggesting there could be a new entrance.
Unsure where the 3rd maze will go to be honest, I find the theme a bit wishy-washy too, but we'll see.
Unsure how the blindfolds will work in THOMC, I'd imagine batching and queue movement will be horrendous, unless they increase the prices to restrict it or limit the amount of timeslots sold in comparison to previous years.