I can come up with a long essay explaining why the Killzone "ingame footage" is a huge fabrication but I'll just cut it short.

How about the fact that only one piece of footage was ever released? And not another word. After spending years making a flop of a game Guerilla can come up with that godly masterpiece in under a year? It's like how 3d Realms marketed Duke: Nukem Forever.

Oh yeah: