In case you missed it, the Civilization VI February update -- which includes a lengthy list of new features -- is available now. This month's update contains the Barbarian Clans optional game mode, Leader Selection Pool, and additional AI tweaks and balance changes. You can find the full patch notes here.
I'm particularly excited about the Barbarian Clans mode, which replaces the standard warfaring neanderthals with dynamic clans that players can interact with and incorporate into their game strategy. Every clan can progress towards converting into a City-State. If the camp remains in play long enough and/or receives enough boosts from player actions, it will transform into a new City-State. It's an exciting twist.
If you missed the developer update video, you can check it out below: