Civilization 5 revolutionized the series in many ways but fans of the older games felt some of the elements of the previous games lacking in the new one. Firaxis responded with an expansion titled Civilization 5: Gods and Kings that added the elements of espionage and religions and brought a lot of new content to the game but apparently that wasn’t the end of it.
2k Games forum members noticed the “Expansion – One World Content” and “Expansion – One World EXE” listed in the Steam Apps Database. No further details regarding an expansion has come to light with neither a word from Firaxis or Microsoft.
The first expansion was well received by fans and resolved whatever complaints there might be from the original release but one can only imagine what more there might be to offer. Whatever it is though, it will surely be welcomed.