Bro, I played KCD2 on Ubuntu the day it launched last year. The games themselves are basically a solved problem and have been for a while now. Multiplayer games with anti cheat are the sticking point now, with only a little bit of progress there.
- work is still ongoing to get performance of direct x 12 games on NVIDIA closer to that of windows.
In addition to all the other replies (because we have computers with powerful GPUs that run Linux, because many other games run on Linux, because all the modern games engines support Linux, etc), in this case one of the devs previous games also runs on Linux: http://store.steampowered.com/app/242110/. That seems like reason enough to at least ask the question of whether they have any Linux plans.
I thought it was: There are 10 kinds of people in this world, those who understand binary, those who don't, and those who were expecting a base 3 joke.
- work is still ongoing to get performance of direct x 12 games on NVIDIA closer to that of windows.