Here's one from a while ago we missed completely! Little Devil Inside [Official Site] is a 3D action and adventure RPG and it's coming to Linux. It was funded on Kickstarter back in 2015 and it seems development is taking a little longer than expected, but it sounds pretty positive right now.

On their Kickstarter, they said this:

We are pleased to announce that the game will be released(aside from PC, Mac & Linux as you all know) for PS4 and XboxOne as a Third Party which means we will be able to release it across these platforms concurrently.

On their official site, they even have a tux icon to indicate Linux support very clearly shown next to the Windows icon too, so it looks pretty solid that it's coming.

Here's a recent teaser video they put up, which really is looking rather nice:

We have a lot of survival and exploration games now, but something about this look quite different. It's not going to be a basic survival game like Rust of ARK, but more along the lines of an action RPG with a big world where you're able to invite people in to play with you, so a little like Borderlands.

About the game:

Little Devil Inside is a truly engaging 3D action adventure RPG game where you are thrown into a surreal but somewhat familiar setting with humans, creatures and monsters to interact with, learn and hunt - journey, survive and discover the world that exists beyond. This game is not just about killing arch-demons and saving the world. Take in the atmosphere and live a realistic life in an unrealistic world. This is a game that tells stories about people with 'unusual' jobs such as hunting monsters and what happens in their everyday life doing so.

No word on a release date yet, but this is one I'm certainly going to be keeping an eye on. Absolutely love the visual style, the animations look fantastic and the UI looks pretty interesting.

Thanks for the tip ziabice!