An IGN reader has taken a picture of a pre-order reservation card that indicates Call of Duty: Black Ops 2 will be released on November 13. I've reposted it above. Unless someone went to a great amount of trouble to create an elaborate fake Target pre-order card, we now have evidence of both the title and the release date of the next Call of Duty game.
For confirmation, you'll have to wait until May 1st, when the official Call of Duty reveal will be broadcast during the NBA playoff that night. Only then will we know for certain the title of the next Call of Duty game. We may also get a little insight into where and when the game is set as well as, perhaps, a release date.
Recently released and leaked Call of Duty images and videos give us some interesting details on the next Call of Duty. I suggest you pore over them until May 1, when we'll have some hard information for you.