"Call of Duty: Black Ops 2" accidentally listed online
The Call of Duty franchise consists of a long series of video games which focus on war-like situations and environments. Each of the main entries has been published by Activision, and for the most part, the annual releases are alternatively developed by Infinity Ward and Treyarch. Gameplay is largely presented via first-person shooter combat, and each game typically features a military solo campaign in addition to heavily expansive online multiplayer game modes.
According to some store pages of the next title, which were accidentally shown on Amazon France for a short while, it looks like the next annual release will be named Call of Duty: Black Ops 2. Although this doesn't confirm any new additions to the game, this implies that the upcoming title will also be taking place during the Cold War era. In addition, it means that the game will likely be developed by Treyarch, who was previously responsible for Call of Duty 3, Call of Duty: World at War, and of course, Call of Duty: Blacks Ops. What do all three of these games have in common? They all feature an incredibly fun arcade-like zombie mode, something which is absent from all of the separate Infinity Ward entries.
There is some further evidence that supports this name. GameBlog, a French media site, was one of the few sources to put up pictures of the Amazon page. This led to a dispute between the site and Activision France. Upon the site's refusal to remove the pictures, Activision blacklisted the site and encouraged other media networks to remove their own stories.
Keep in mind however that this doesn't necessarily guarantee that the final product will be a story sequel to Call of Duty: Black Ops. It is possible that the name shown was just a tentative title. Since the Call of Duty franchise has been extremely profitable so far though, I would be surprised if there wasn't a new title currently being worked on.