Civilization 6 received a substantial update today in the form of its 'Fall Update' patch, ushering in DirectX 12 support as well as a host of sweet gameplay additions. As far as the latter is concerned, there's a new multiplayer scenario called 'Cavalry and Cannonades', as well as two new map types in the form of Four-Leaf Clover and Six-Armed Snowflake. According to the patch notes, these map types are "designed to encourage more conflict".
As the first major patch for the game, the list of updates and tweaks is extensive. The user interface has received a number of fixes and improvements; AI is better tuned, and the list of bug fixes is very long. You can read the whole spiel over here, and then compare and contrast with some of the beefs Evan had with the game earlier this week.
As far as DirectX 12 support goes, the patch starts with AMD cards, as well as Nvidia Maxwell series cards and upwards. Firaxis advises to make sure your GPU drivers are updated before booting the game.