Was this scrapped? I would of loved to have seen that level.

It looks like it's supposed to be in the mission "Semper Fi or Die". It's the one where you get an achievement if you keep all of the Marines alive until you reach the next building during the Ceph assault. It's probably some kind of promo art done for the release of C2 - or some fan art (would be some really good fan art!). The things that throws me off is that it doesn't seem to show Marines, it's Cell soldiers or whatever.