Those who think this could run on any currently existing consumer PC have no idea how computer graphics work.
This demo is so far beyond today's graphics it's ridiculous. Crysis 2 and Unreal Engine 4 can go to bed.
Too bad the next console generation won't actually have graphics like this though! Not only because the consoles won't be powerful enough, but because this stuff costs a fortune in time and money to make and gaming is struggling economically as it is.
But it sure was nice to look at!