My amazon pre-order came through the door today - one word? Fantastic.
It's the face capture tech that does it. You've got to watch peoples expressions when reacting to your questions (as a 1940 cop) and grill 'em, accuse 'em, tell if they're lieing (or not!)..etc. I don't think that's been done it a game before.
One of the nearest thing we've seen to an interactive film.