Today the 'Australian Summer' update landed for the Windows version of Civilization VI [Steam], but the Linux update is a little further out.
I spoke to Michael Blair from Aspyr Media who confirmed to me it's due in a few weeks:
QuoteWe are working on getting the submission build ready for 2K approval, and hope to be live in a manner* of weeks.
*They meant matter, to be clear.
While it's a shame they aren't able to get it ready for day-1, it's good to know they aren't sitting by making us wait longer than needed. Hopefully 2K won't take too long to approve the Linux update.
The Australian Summer update adds in: Steam Workshop support, the ability to play in actual teams and not just formed alliances (multiplayer), True Start Location to put Civilizations on the map at their geographic origin and more new features. On top of that there's plenty of balance fixes, AI improvements and bug fixes.
It also adds in a paid DLC for the Australia civilization which comes with a scenario pack too.