SCUM [Steam], an open world survival game from developer Gamepires (produced by Croteam and published by Devolver Digital) is shaping up to be one of the most exciting releases this year and it seems Linux is in their plans.
I've been following it for quite a while now and they've talked about Linux support a few times. Back in 2017 they said:
We will probably support Linux but after first initial EA PC Windows release and probably before any console relelase. We are using UnrealEngine 4 so there is no connection with tech used by Serious Sam 3 but I don't think we will have any problems porting game to Linux.
They didn't go silent on it like some developers do, they said again in January that "Linux will be very likely supported very soon but not on EA release date." and they also mentioned in July that "Linux will play with other PC players when is done.".
Given how often they've confirmed it, I think we can say this is quite likely.
More about it:
SCUM aims to evolve the multiplayer open world survival game with unprecedented levels of character customization, control and progression, where knowledge and skills are the ultimate weapons for long-term survival. Combining the methodical planning and management of hardcore survival with optional PvP ‘network events’ available to everyone at anytime, SCUM strikes a unique balance between complex simulation and intense action in the next generation of survival game.
For another look at it, check out their recent developer livestream that's up on YouTube. The ridiculous customization, along with the decent graphics and special event system all sound rather enticing. That's on top of NPCS, animals, realistic bullet physics, a team system and so on all have me rather hyped.
If you do want to see it on Linux, a good idea would be to say so in this Steam forum topic and to add it to your wishlist. Ensure you've set Linux as your platform perference in Steam's account preferences page (at the bottom).
It's due to release for Windows today, so hopefully with Steam Play if people decide to check it out on Linux anyway you will end up as a Linux sale…I would be surprised if it worked there though, since it likely has anti-cheat (which often doesn't work with Steam Play's Proton/Wine).