Dynamic Effect in Maya?

[KiriSof]

There is an effect i need to do in a project i'm working on that is in the Shutter Island trailer. Check it out:

http://www.youtube.com/watch?v=5iaYLCiq5RM&feature=player_embedded


There is a woman turning into ashes at the end of this trailer. Is that done in Maya or is AE involved too? Can you guide me into doing that?
Thanks
Kiri