Well the people that were on the train said staff were coming to help, this is further evidence that they had the intentions of evacuating them before the lift was re started and therefore they must have known about the stalled train.
^Unfortunately there isn't any information on the investigation yet, only that its on going. In regards to Scarefest, Sub Species sounds incredibly interesting.
I was there on Friday and it was certainly busy, there was a lot of people there, but they wasn't riding anything and queues were 0 to 10 minutes at most.