Details on the expansion are few and far between, but the currently untitled add-on will include new Native American civilisations, new content for existing European civilisations, new maps and a new single-player campaign.

Age of Empires III didn't really break any new ground on its release late last year, but it was still a very competent RTS. No firm release date has been set, but you can expect the expansion to hit retail stores in the autumn.