The hypothesis is that they were focusing on interior construction first, since the GP can't see into the maze, and then doing the facade last so that the announcement doesn't get spoiled. So while previous years might've had facades go up at halfway completion, this year might've had them up at the point they were nearly done.
I do think it was odd that it took this long for the Tram Garage mazes to go vertical. That's the part that worries me the most. The backlot mazes look more or less finished though.[/QUOTE
EXACTLY!