A senior brand manager for Activision made the announcement during his talking at a recent meeting. The company has not made it official as of yet but it is just about as official as it can get given the source where it came from.
A company spokesperson stated that "We can’t confirm or deny this, however it certainly shows that there is a lot of anticipation surrounding this release, which is clearly good for us."
That is true to say the least as Call of Duty 4: Modern Warfare is one of the most highly-anticipated games this year.