As per this story on Voodoo Extreme, one can guess that Infinity Ward aka Call of Duty guys will announce next Saturday a new Call of Duty tidbit. Whether or not that means Call of Duty 4, new content for Call of Duty 3 or something else entirely who knows. My guess is on Call of Duty 4 for PC though. We'll see next Saturday! Here is the "tease" that Infinity Ward posted:
Insert boring update about some mundane 'what we're doing' detail that no one actually cares about (such as new employees or kleenex testing) because they're just reading these updates for the glimpse hope that we'll slip and say something we're not suppose to about our next title, or that we're going to allude to the fact that maybe, just maybe something that actually is interesting is coming up in the near future (and by near future I mean next Saturday).
Amazing Things To Happen On April 28th:
1758 - James Monroe, 5th President of the United States is born.
1788 - Maryland becomes the seventh state to ratify the Constitution of the United States.
1932 - A vaccine for yellow fever is announced for use on humans.
(Then nothing really happened for a long time.... but now....)
2007 - What goes down this April 28th is equal to, if not surpasses, the magnitude of any of those.