Activision has updated Call of Duty's official site with a new splash page saying that, on May 1, there'll be a "World Reveal". Given the increasing buzz/chatter flying around it's probably for either Black Ops 2 or, as was rumoured over the weekend, Call of Duty: Eclipse. And that's it! Tease over.
Code name: Call of Duty: Eclipse [rumor via Kotaku]