The Australia Civilization and Scenario Pack for Civilization VI is available now on Steam
for $4.99 USD. It adds Australia as a playable faction, under the guidance of leader John Curtin who was Australia’s Prime Minister during World War II. The update comes alongside a new patch that brings a number of balance changes and bug fixes.
Here's the skinny.
Australia is a civ that gets bonus housing for coastal cities, bonuses for building Districts on attractive terrain, and additional production if targeted for war. Australia’s unique unit is the Digger (which replaces Infantry), and their unique improvement is the Outback Station. Australia can grow and thrive in places where other civs would struggle. The Outback Tycoon scenario is a unique, non-combat scenario where you will try to enrich your new territory in a randomly-generated Australian interior. And Uluru comes to Civilization VI, bringing religion and culture to the territory that surrounds it.
For more info and patch notes, head here