A new expansion for Civilization V could be on its way, according to a listing on the Steam Apps Database. The listing for the expansion is named “One World”
While digging around the depths of Steam's file registry, some Civ fans found a list that contains a couple of mysterious entries at the bottom: Expansion One World - Content and Expansion - One World EXE. On the official 2k Games forums, speculation is already taking it as a given that this is a done deal.
The last expansion for Civilization V was last year's Gods & Kings, which added new civilizations, scenarios, and leaders to the game as well as a reworked combat system.