I'm not sure, but what I do know is that I won't ever buy a Firaxis Civ game again without a long probationary period. It's like with HoMM series, after the 3rd I thought that there won't be as glorious day as HoMMIV release but boy was I wrong! Now when I see Ubisoft logo or HoMM6 trailers I only shrug. No chance I'm buying that crap. Of course, parents will buy them for their 10 year old kids, so I'm not preaching doom here, only stating my opinion.