I just came across plenty of brainstorm ideas asking for the same thing: the Human list as default theme for GDM. Tt is way more user friendly, though it still supports the "old" way of entering your credentials. I even found a blueprint, with specifications describing to default the ubuntu login to a face browser. It also talks about a fancy OpenGL based facebrowser, of which there is also an article on ArsTechnica.
Therefore my question: what is the status of this OpenGL based facebrowser, and will it (or if not finished yet, the Human List theme) be default for Ibex as proposed for Hardy?