Disney software lets directors change actors' expressions in post-production

Already, audio engineers can use software such as Pro Tools to change the inflection of a person's voice after it's been recorded. Soon, however, movie directors may likewise be able to alter an actor's facial expressions after their performance has been shot. They could do so using FaceDirector, a program created through a collaboration between Disney Research Zurich and the University of Surrey.

First of all, FaceDirector doesn't generate expressions from scratch. Instead, it morphs between different expressions that were previously recorded in separate takes of the same shot.

http://www.gizmag.com/disney-facedirector/40904/