Quantic Dream's David Cage showed off some amazing motion capture video at GDC 2012.
The creator of Heavy Rain said that the Kara demo can be run on a PlayStation 3. It shows an android being built and gaining consciousness, as well as demoing some jaw-dropping motion and facial capture technology. Just look:
Cage says that Kara is just a demo, not indicative of his next game, but I remember back at E3 2005, when Sony was first showing off the PlayStation 3, there was a character demo from Quantic Dream that showed off amazing facial animations using at least one character who appeared in Heavy Rain. So you never know.