I did maze backstage tour yesterday and they confirmed that the Lionsgate mazes will be leaving and replaced with their own mazes after this year. The Big Top is the start of transition to their own mazes and will stay for the next 3-5 years. They're hiring the tents out but after each year they will be buying one of them. They also said though Big Top is staying, they have the freedom to change characters/storyline in future if they would like to.
A lot of the props inside Big Top are from past rides and experiences, there is a large drum from Miss Hippo's, and all the clothes on the rack in the makeup scene are costumes from old mazes.
The Big Top has lots of clues to WC16, two of the clues allowed our group to work out what the IP of the new ride will be ( as we are well clever). Containment has a lot of clues too, I really like how their Fright Nights attractions are teasing the new ride and I hope they do this again with attractions linking into each other.