purplexus - sorry to mither you.. I take it from above that Civ Gold 4.0 will work with BtS? Also, will Scotland feature in the next lineup?
4.0 won't compatible with BTS right away. We'll have to make the necessary changes, remove the duplicate civs, etc. But a BTS version will be available.
As for Scotland, they are currently available and will remain available in future editions.