Developer Firaxis will release an expansion pack for Civilization V this spring, it said today.

Civilization V: Gods & Kings will mark the return of religion and espionage, two Civilization IV features that were absent in the fifth installment of the popular turn-based strategy series.


It will also "reinvent the diplomatic system" and add a host of enhancements to the combat and city-state mechanics from Civilization V.

We'll have more details — including an interview with lead designer Ed Beach — about the upcoming expansion pack later today.