We were there last week. Castle closed Monday and Tuesday. Scaffolding, tarps. the whole thing.
We went to Knotts on Wednesday...came back Thursday am, and there was the Castle!
Sneaky, sneaky...but we were pretty excited. Walk-through was open too.
Not sure what they did, we didn't see any difference.
Not sure if this was answered, but the sleeping beauty walk through is definitely open too