Firaxis has announced the sixth and final DLC pack in the Civilization 6 - New Frontier Pass.
The Portugal pack includes a new leader and civilisation (Portugal, obviously), the new optional game mode Zombie Defense, two new world wonders in the Torre de Belém and Etemenanki, and a new Wetlands map script.
Firaxis is saving a deep dive on Portugal for a future update, but as you'd expect the civ will revolve around naval gameplay, particularly maritime exploration and trade - something not a lot of other civs specialise in. There's more in the video below: