A viedo of Inside Xbox has been released with Escalation details. But they mainly show Call of the Dead. http://www.youtube.com/watch?v=FO_Z-gu880I
The intro is George Romero talking. What he says is that he was doing research for a WW2 movie, and found the Group 935 files of the zombies. Apparently, he recreated the zombies through the research, as human surgeory is being preformed after his explanation. This means that the zombies are going through the public eye. Romero says that some of this bullshit happened right here, meaning he recreated the zombies for the movie. Those intense seen of a pitchfork, a double barrel shotty, and other cooling decapatating scenes are probably just for the cut scene. Romero's recreation of the zombies turns chaotic, and he goes crazy creating the zombies to kill the player.