Lockedoutlogic simply said CMs know nothing. The planners I talked to before my wedding at Disney discussed the Grand Floridian DVC construction before it was announced. Before we signed our contract, they told us exactly what would be happening during our wedding and what pictures would be affected. They also told us about possible cranes that might be in the background of the pavillion looking towards the Castle. That would be the fantasyland construction---I don't know the timeline on that though as to when and what had already been announced. So while I can't prove that CM's know anything about attractions, I will say some def know about certain construction projects before the general public.