I feel like that is for either a "back-up" Chance for a show or for the house.
Since the actress that played Chance last year was also the same actress that helped "create" her during the Carnival of Carnage show back in 2007 and is also the same person they picked to use in the promo images this year, I can't see them picking a NEW person to play her on stage. She literally IS Chance and to have anybody else play her in a speaking/acting role would be a mistake.
However, I fully expect multiple "Chances" inside her house. I don't see them putting Chance inside the Scarezone because of the massive line that would form for pictures...a disappointing fact that we have to deal with now when you stick an iconic character in the streets, it becomes a Disney style Meet & Greet. We are getting a Chance SZ, but I feel like it would include the massive stage location from last year and will host the show.
I really hope a show does happen because she killed it last year and I can't wait to see the kind of energy she puts into this years show now that she is the Icon.