New expansion announced.
-Expanded Dark Ages/Golden Ages, inclusion of a new type of Golden Age, the Heroic Age (a reward from going directly Dark Age=>Golden Age)
-New Social Policies you can only get during said Ages. Dark Ages apparently contain some powerful assholish policies. Possible return of Slavery mulching dudes to rush building?
-New districts
-Governors, a step between Great People and Leaders. You assign them to run your cities. All governors in your civ pull from the same pool of governor points, so you have to decide whether you want a few very strong governors, or a lot of weak governors.
-Loyalty mechanic brings City Flipping back
-New Great Wonders
-New generic military units to fill in holes in advancement
-Some manner of Ice building so that ice doesn't feel so horrible
-Quests that trigger on world events, making one civ the "bad guy" and providing a way for the other civs to catch up to/beat down that civ. The "bad guy" civ can also win the quest. Whichever side wins gets a permanent buff for the remainder of the match.