So the new Exorcist seems to have bombed in test screenings (note: this is coming from anonymous sources I can't vouch for and being picked up by some sites I'll vouch against, so take with a big spoonful of salt). If that turns out to be true, it demonstrates the danger of bringing in untested properties - you can wind up with a Dracula Untold or Doomsday situation. Of course, the worse scenario is that the poor reactions cause reedits and reshoots that push the film off its release date (which is already half way through the event) and you lose the house at the last minute.
I remain very slightly skeptical that Exorcist will show up at the event this year.