Looks like there's no smoke without fire. The video after the break apparently shows a "membership" plan for Call of Duty, via Modern Warfare 2.
If a video recorded by a 360Junkies member is to be believed, the sub-plan would be payable via MS points.
The video shows the player trying to join a multiplayer session in the game via a friend's gamercard, as detailed below.
"I was trying to join a friend's session on MW2 the other day and had this screen pop up. It clearly says at the top of this menu: 'Modern Warfare 2 Membersh', in which we can confidently assume that the last word is "Memberships". If you'll notice at the bottom is an option to "Add Microsoft Points", clearly indicating that this was intended to be a menu for purchasing different levels of Membership, presumably memberships would have been offered in a variety of durations."
Remember, this could be anything. We'll try and get a comment from Activision.