Aspyr Media told me today that Civilization VI [Steam] for Linux & Mac will get cross-platform multiplayer when the next patch drops for us.
This is awesome to hear, since I know a few people waiting on it. The new 'Spring 2017 Update' is a big one too, with lots of balance changes, AI tuning, bug fixes and more. You can find all the changes to come in these patch notes.
Once the patch lands, we should then see the Persia and Macedon Civilization & Scenario Pack DLC support Linux too.
We will hopefully livestream another weekly session soon, when Samsai can recover from the nukes that were dropped on him. It's a damn fun game and I'm looking forward to playing more of it. You can read my previous review here.