From the Official Disney Parks Blog:
This year, the party will feature something extra special for guests viewing the parade from Main Street, U.S.A. This will be the location of a new pre-parade, the Not-So-Scary Street Jam!, which will take place after the Headless Horseman passes and before the “Boo-To-You Parade” begins.
Check out the video below to learn the dance steps for the party’s new line dance, which will be performed to the song “Calling All the Monsters” by China Anne McClain.
http://www.youtube.com/watch?v=u3qBOyFxRdQ