Man I can't wait until we can put a bunch of stem cells on scaffolding and reactivate certain embryogenic pathways to grow organs. Maybe even faces, though what you'd get is a baby face.
Also, faces (i.e. skin) is actually the easiest organ to grow, and doesn't need stem cells. I read about a burn victim where they took some skin from under his belt buckle (The only non burned skin on him), and stretched, then split, then stretched some more till they were able to cover him (took months).