Ah, I see.  I didn't know about that part.  That actually sounds like it might be fun, as you shape your culture according to the geography and history that you make as you play

SimpleStacker

There are definitely requirements for unlocking certain options. There's a historically accurate path for each civ, but then I noticed in one of the videos Egypt couldn't turn into Mongolia without having some quantity of horses. 

It seems like the point is going to be to have civilizations based on the circumstances of the game. That would alleviate the issue of playing as Mongolia only to learn that you have no horses or other similar geography bummers.

Undisciplined

gaming

Which game sequel are you awaiting the most?

I agree with your idea of it.  But the way they have it, it seems like just something you pick mid-game.  Seems artificial.

Maybe it will be like you can only pick certain cultures if you met some requirements.  That might be interesting.