https://www.gamespot.com/articles/civilization-6s-first-expansion-rise-and-fall-anno/1100-6455221/

Publisher 2K has revealed the first expansion for Civilization VI, called Rise and Fall. The expansion adds eight civilizations and nine new leaders.

In addition to the new civilizations, Rise and Fall adds eight new world wonders as well as new units, districts, buildings, and improvements. It also expands the Government and Diplomacy systems.