I swear Hasbro does it on purpose. They design great figures and cancel them...just so they can sell a few for $100 apiece then turn around and put them into production in a future wave/line. Anywho, Hasbro was on to something with the Emma/cyc/colossonaut 3 pack then they cancelled it. I have my suspicions that Ms Frost may pop up in the Avengers Infinite line in the future but I didn't feel like waiting, so:
Head: Rogue, Hair: sculpted hot glue
Whole Body: Dagger
Cape: Star Wars Sly Moore (Coruscant Senate)

I did a lot of searching for a cape/accessory for her. It's not exactly like the prototype but I like the fur texture sculpted into it.