I think they realized that...the game will be 2 years old when diplomacy comes out... which means prolly another year for the last... which, when compared to other companies... most games were done with the expansion packs by the end of year one (unless there is a stupid number of them, like in the sims), and were finishing up the sequel by year 3. (cept starcraft, but they are "special")
I mean... january 2011: the expansion to the 2008 game of the year comes out... just doesnt quite work that way i think.