Yes, we're already at the point where we can re-animate dead actors and put them into films using digital 2D-to-3D rendering techniques. Check out the video:
I just thought this was very, very cool. Someday soon, doctored videos will become as popular as airbrushed (or otherwise digitally manipulated) pictures. These sort of animation advances are already having an effect on Hollywood, replacing the often-tedious motion capture of previous years. And this second video gives you proof of how far the technology is taking film and TV right now (New York Times video, you have to sit through a commercial first, but the wait is worth it).