This REALLY made me roll on the ground laughing, I think I even broke my back. GG spine. Haha, just kidding. But here's the point.
This has to be the FAKEST trailer I've seen for an attempt to convince players that Modern Warfare 3 is coming soon. Like... There's no killing or ANYTHING in this, but they give you a giant SEVENTEEN pound machine gun, no offense to you nerds, but there are nerds that can barely lift ten pounds.

Call of Duty Modern Warfare 3 Preview - The Modern Warfare 2 - Xbox 360 | PlayStation 3


P.S. Infinity Ward has clarified it is fake, but there will be a Modern Warfare 3 coming after Black Ops.