A simple reply to a tweet is probably the most positive indication that we have seen yet for Civilization VI [Steam] actually releasing on Linux.
While we know that Aspyr Media are behind the Linux port of Civilization VI, their previous communication in public was a little concerning in regards to it actually seeing a release. It seemed they were having issues with it, when they said about getting the game to "perform to our standards".
It's possible we may see the light at the end of the tunnel:
@draxil Absolutely. We won't keep you guys in the dark... But it's looking good, so don't count us out yet. :D— Aspyr Media (@AspyrMedia) November 8, 2016
That was in reply to a user asking about a Linux version.
Thanks, reddit. I will keep you posted if I hear any more on it.