Talk:Now You See Me, Now You Don't/@comment-24803028-20130823181423/@comment-24803028-20130823190420

Look at this trivia on the page:

And Janel Parish AKA The actress of Mona vanderwaal confirmed that it will be revealed in this episode.
 * Someone (probably Red Coat) will be revealing themselves to Emily

I just put 2 and 2 together hun.