Civilization V may be getting another large chunk of content. A listing for an expansion titled "One World" has been spotted on a database, fueling rumors of more content to come for the world culture simulator.
The executable file listing was spotted on the Steam Apps Database, and then spotted by users on the 2K forums (via Joystiq). This is far from a solid confirmation, especially as Firaxis hasn't mentioned any upcoming content, but it does give eager world-conquerors reason to hope for some more variation coming to the game--as if it didn't have enough already. 2K has responded with the usual "we do not comment on rumors or speculation" line.