Director Alfonso Cuaron has said that roughly 80 percent of Gravity was hand animated in the computer. In fact, when the actors are seen in space, only their faces come from live action photography. The environment, their bodies, even the visors in front of their faces, are CG. The helmer also said that Lubezki was involved in determining the lightning for the entire film, which included going to lead VFX house Framestore to work with the digital artists."
It will be interesting to see how this turns out.