corovanrobber
King
Well, as I see Civ5 structure is very similiar to Civ4, so new civs would be very easily to be added. Only two problems are leaderheads and voices for them, but who cares - static images IMO are ok for early placeholders, aren't they? Maybe RFC for civ5 would start already with Spain, Mongolia, Netherlands, Portugal, Scandinavia and even more, why not?