Daniela, Kelly, Cindy, Blanca and Devon seem like they'll definitely be going. They've got good ties to the brand. I can see Robin Holzken, Marilhea Peillard and Sonya Gorelova all going to castings but whether they make the cut is another story.
Most of the time from the fittings videos, it seems that they put the girl in the outfit during fittings and then tell her on the spot. Granted they've shifted around who opens/closes occasionally (if I remember Dangerous Liasons in 2012 was supposed to be opened by Doutzen, closed by Lais but they changed it around due to her injury)