I voted for TeamCG just to try to balance out this. I'm not sure and what I definitely don't believe is that we'll get anything nearly this quality in an actual game, but it could potentially be done (cleverly and with lots of tricks) in real time with... 8GB DDR5 RAM!
It's probably a real person, but the way he acts makes it look so suspicious... lol
Have you seen Joakim's eyes? They're marble white. Even away from the iris, where eyes tend to get redder or yellower, his are solid white. I'm not pointing out the difference in white balance between his and Geoff's shots but specifically the lack of a gradient in the actual colour of the eye.
Pretty much what you might suspect if someone filmed Joakim in one of those light box thingies NVIDIA was going on about recently and then stuck in some eyeballs, for instance.
So I went a-looking for mistakes and found this:
On the top left you see Joakim's eye looking away from the light, on the bottom left looking more or less at it, on the top right Geoff's looking away, on the bottom right looking at it. Someone's pupil is malfunctioning.