I think the Mayans ought to be in the first expansion with the Inca, but I wonder if having them and another North American Native American civ might be deemed too overrepresentative--it's entirely possible we get one of them in the second expansion or in DLC.
But we will see. I hope that 10 new races are added, that would help cover some of the gaps caused by Firaxis' Eurocentric vanilla build. We may end up with only one African nation and one Asian nation added in the first expansion, perhaps. But we can only really speculate.
Wrong re: Lady Six Sky; we have relatively good records and scholarly consensus as to her warrior status:
http://www.mesoweb.com/encyc/index.asp?passcall=rightframeexact&rightframeexact=http://www.mesoweb.com/encyc/view.asp?act=viewexact&view=normal&word=Sky&wordAND=Lady+Six
Quote from the page:
I should add that Lady Six Sky was not the only successful Mayan warrior queen. In fact, of the Mesoamerican civs, the Mayans are the best candidate for a female ruler. There are several excellent options for Mayan queens who actually ruled as such (instead of merely being the wife of a famous Mayan king or the grandmother/mother of a famous king); the ones that stand out, however, are
Lady Six Sky (known for her calendrical rituals) and
Lady K'abel (read
here and
here about her, including her status as Kaloomte, or "supreme warrior," which gave her greater authority than the king).
As to the dislike for female warrior rulers, consider that many impressive (ancient/medieval/Renaissance/Enlightenment) female rulers in history were warriors--I think in part this may have been out of necessity, as women being wedded to men and holding lesser power is a very common tale indeed (Jadwiga is unfortunately one example, and regarded by at least some Polish posters in these forums as not having actually ruled all that much despite her status as a queen).
A warrior queen like Zenobia or Lady Six Sky holding power in her own right would probably have to have some authority over her armies to rule without being rebelled against, i.e. military authority. Queen Seondeok, who lacked such authority (and was revolted against unsuccessfully by a Silla official), at least had the loyalty of a great general, Kim Yu-sin, to defeat such rebels. Of course, if the tales be true, Tomyris was a widow who resisted being added to Cyrus' harem, in part because that would have given him authority over her lands, and over her. I should also point out that Catherine the Great and Maria Theresa are seen as "warriors" in the sense that they were very successful conquerors--and Elizabeth wore armor before giving her speech to English soldiers when defending against the Spanish Armada.
Women representing themselves as warriors was often, it seems, the best way to demonstrate and possess some authority as a ruling monarch. Rulers in societies as far away as Egypt and England often were expected to defend their nation successfully (hence the reverence for Senusret III and Henry V, though both had numerous other accomplishments on a domestic level that were arguably as important as their military accomplishments).
It occurs to me, though, some Civ fans may not want too many female rulers, so we might see a male Ethiopian/Mali monarch instead of say Queen Idia or Yaa Asantewaa for Africa, to balance out any female Mayan monarch or Byzantine monarch, etc.