Found this on TTSP Forum.
"I went to the Southparks event yesterday and it was very good.
When we were doing the big top BTS our guide said there were clues to WC16 and one inparticular was a big hint according to him. The clue was the box in which a person usually sits in and pretends to be a robot or automaton and then bangs on the box to scare you. On the box were cogs which were decorative. This ties in with the clues that have been released. Robots, cogs and fear. I still dont know what it could be though."