Board Thread:Spoilers!/@comment-26159109-20151007195419/@comment-4453062-20151007205833

Farerb wrote: That is not the 100th episode. That's the 99th episode. Adam has gone back on what he said about Smash the Mirror previously, and they're now considering it 2 episodes. He has also stated specifically that the first half of Season 5 would only be 10 episodes long, so that the 100th episode can be the Spring premiere. So 10 episodes for the Fall, and 12 episodes for the Spring.