With the new G+K site of Firaxis up, there are a lot of references to a 4th scenario, which is probably decided recently to put in because the Info page (http://www.civilization5.com/godsandkings/us/info.php) first mentions 4 scenario's, but at the Scenario paragraph they only list the 3 previously known. What do you think it will be? What do you want it to be? Personally, I'm hoping som sort of historical reenactment of a famous battle, like D-Day, Operation Market Garden or some other 'modern' battle. I hope some focus on naval warfare, the new units/era and espionage. D-Day could have it all I think.