The official Limited Time Magic site has announced an upcoming Limited Time Magic offering for September 13, 2013. The event has been teased previously and is called Unleash the Villains. It will be taking place at Hollywood Studios from 8 PM – 1 PM on Friday, September 13th.
According to the official Limited Time Magic site:
The Disney Villains will be waiting for your arrival as they make their way to the dead center of Disney's Hollywood Studios. Come along for this devilishly delicious affair, on a night jam-packed with13 dastardly Disney baddies and a host of fiendish festivities. It's a one-time event you won't soon forget even if you try! And be on the lookout for further announcements and more details as the date of the event draws closer, only at Disney Parks!