Included are three maps with variant scenarios. The North America and Asia maps were taken from this site, DarkAttila made the asia map and sistrunk made the north america. I made the Europe one myself. The person who made the North America map put a horde of Iron boars instead of Wild boars which attack and destroy just about anything. I think I deleted and changed them all, but there is no way to know for sure which type of boar it is without play testing.
In the North America-Colonization map the Old world has been included, trading using ships is recommended. Also the colonial civilizations are Britain, Spain, France, Vikings, and Chinese. If you are wondering about the last one you should read the book 1421.
If you want to change your civilization, then you have to do a couple things to keep the civs in the right spots. If you want to be player 4, then change your color to four, yellow, and change your civ name to the same as four. Then change player two's civ to what player one was, player three to what player two was, and player four to what player three was.