OH WOW! It looks fake, it sounds fake, well shit...
IT'S FAKE!
Comment from the youtube video:
"This is fake! Its a publicity stunt for Dantes Inferno! >_> sorry for the people who think this is a real game! Look it up."
So I looked it up
Also, in that site Azuran linked, go to the bottom where it says "Prayer Works Interactive is a new game-development company founded in Boston in 2007." Click "read more." That's all the evidence you need.