What is a man?

I know almost nothing about this game, except that I probably won't be playing it any time soon. I didn't play the first one, and I probably won't for a while, especially now that this teaser has seemingly spoiled what I assume was the big twist. But they say the thing, so I feel almost obligated to post it.

Robert Carlyle does his best, but, alas, a pale shadow of the original.