I'm seriously impressed by the guys at EA (never thought I'd say that). EA have purchased the web domain www.modernwarfare3.com.
Click on it. It redirects you straight to the Battlefield 3 website.
Now, chances are the CoD guys were never wanting that domain, as they use @infinityward in the past, and callofduty.com. Either way, its a neat little prank.
Or at least in my eyes :P