It's been rumored that Kmart started selling early copies of Modern Warfare 3, and this YouTube video looks to back that up. The video's creator claims he went in and grabbed a PS3 copy of the game, paid for it, and took it home. His copy of the game certainly looks legit.
He then shot this video, which shows a (quiet, not-great-quality) recording of the game's menus and opening sequence. It looks the same as a video that Luke posted earlier, so we're guessing it's legit. Probably only a matter of time before this video gets pulled, however.
Obviously, there are spoilers for the game's opening here, so watch at your own risk.
UPDATE - Reader Dan sends us a much better version of the intro, which we've dropped in. Thanks!