Modern Warfare 2 Opening Footage Leaked?

People looking to avoid Modern Warfare 2 spoilers should not read on. A remarkable video (below) of what's purported to be the beginning of Modern Warfare 2 has appeared. It's in French, and we've obviously no idea if it's definitely real at this point, but it seems to be showing the first level of the game, in which you play a terrorist mowing down innocent civilians in an airport.

It's a useful gaming device: put you in the enemy's position for a glimpse of the other side. Interestingly, however, it's one that Infinity Ward never opted to do in the original Call of Duty WW2 games, avoiding letting you play as the Germans despite showing different nations' perspectives on the conflict. Putting you in the position of a terrorist killing civilians is clearly a very controversial decision. It could be designed to give the player a horrible view of those they're fighting against, but if this is the case it will be a contentious way to start the game. All speculation for now, clearly. Here's the video: