ModernWarfare3.com would seem like something that would naturally be in the hands of Activision. However, going to the website immediately forwards users to battlefield.com/battlefield3.

The domain of ModernWarfare3.com was apparently registered privately all the way back in 2009. The change to the domain was apparently made just a couple of days ago, indicating that EA may have acquired the site domain recently or that a Battlefield fan recently changed.

Source: CVG