Herald: An Interactive Period Drama - Book I & II released for Linux recently, but sadly it got a little buried in my inbox. It's an interesting mix of a visual novel with a point & click adventure and I took a look.
Zombasite: Orc Schism is a newly announced expansion to the action RPG Zombasite, which isn't bad at all and this expansion will add quite a bit of content.
Pyre, the next game from Transistor developer Supergiant Games is coming to Linux! The port is being done by Ethan Lee and it should see a day-1 Linux release.
Ashes of the Singularity: Escalation will come to Linux if Stardock see enough requests for it. The CEO of Stardock has requested to see how much interest there is.
Setting itself apart from the majority of visual novels by focusing on the player’s sense of hearing, BlindQuest: The Prison will also be coming to Linux if greenlit. There’s a short concept demo available too.
With detailed equipment and management aspects, Bounty Train also has plenty of thrills and chaotic fighting. It’s being ported to Linux and should be coming out sometime soon.