And we are now at the 19th dev diary for Ara: History Untold.This time the devs talk events. The events will be more important than in Civ4, and more comparable to Old World. They are used for role playing, and to show progression through history. There are also inter-related invents, which build upon each other, really telling a story.
Unrelated to this last dev diary, there was also another Q&A recently, and we know in the meantime all the leaders. For more info please check this thread.