"You are once again Gordon Freeman," described Gabe Newell, managing director and co-founder of Valve. "You are awakened in the future. Several of the characters from [the original game] are back, including Barney the security guard, the G-Man, about whom you learn more and in whose employ you now are, and several of the scientists. There are new characters as well, most prominently Alyx, whose mother was killed during the events of the original game. The story is once again conveyed entirely within the course of playing the game."

Maybe people will now quit sending me that lame NVidia exclusive rumor eh? Hrm, probably not. :)