The Total War team along with Feral Interactive have confirmed that Total War: THREE KINGDOMS is officially coming to Linux.
Honestly, I don't think this was supposed to be confirmed quite so soon. Especially given that Feral Interactive only teased something big for us next week. This has replaced the "Working with fire and steel" teaser that was on Feral's port radar, with one teaser still not named yet.
I actually follow the official Total War blog, where the developers post all sorts of updates about what's coming. Right down at the bottom of the pre-order FAQ for Total War: THREE KINGDOMS was this:
Will the game be released on Mac and Linux?
Yes, Feral Interactive is working on macOS & Linux versions that will release shortly after the Windows release. You can expect those to land later on in Spring 2019.
As I was writing this, Feral Interactive then also confirmed it on Twitter and their official site requiring me to hastily re-write this whole thing before publishing, but hey it happens. Feral are saying it will be due "shortly after" the Windows version.
Anyway, here's a little more about the game:
Total War: THREE KINGDOMS is the first in the multi award-winning strategy series to recreate epic conflict across ancient China. Combining a gripping turn-based campaign game of empire-building, statecraft and conquest with stunning real-time battles, Total War: THREE KINGDOMS redefines the series in an age of heroes and legends.