If they really have been working on this for the past 4 years like they say, I wouldn't go as far as to say it will live up to the trailer and hype but it's still a unique idea that hasn't been done to death so unless they sell out or really fuck up, I think it will still be a good game.
If this wasn't an indie game it would have no chance. An AAA studio or publisher would never risk pursuing a new idea like this in the first place though