The FPS junky in me approves of this, the developers of Insurgency added the Linux port to their official Trello todo list, and it looks like it already runs.
Sword Coast Legends certainly looks like a good RPG to have on Linux, but sadly it seemed rather buggy and unpolished in the early builds they released, so they have delayed it.
Noct is a game I'm really excited about trying, as it's a pretty unique take on the survival genre and it looks freaky. It is going to officially release on November 22nd.
The Vanishing of Ethan Carter looked fantastic when we heard about it, and now they have moved to Unreal Engine 4 with The Vanishing of Ethan Carter Redux it looks like we are closer to a Linux version.
Grid Autosport could see a Linux release soon, as an eagle eyed anonymous user emailed in the fact that it's now in the "Very Soon" column of the Feral radar.
XCOM: Enemy Unknown is easily one of the best strategy games ever in my eyes, so if you haven't tried it I seriously think you should try it since it's free for a weekend. Also, XCOM 2 looks like it will be a day-1 release.
Mutant Factions is a pretty nice looking top down online shooter, and the developer let us know about some great changes recently. It has a free demo right now too.
Well now, this is unexpected. It seems we may be getting quite a few of the Saints Row games, as Saints Row: The Third is showing signs of coming to Linux.
Medieval II: Total War has popped up on SteamDB with Linux information, and we also have Feral Interactive teasing us on twitter again, looks like they are behind it.
Exciting news! Road Redemption is a title I've really wanted to play since I saw it on Kickstarter, as a spiritual successor to Road Rash which I played when I was younger.
I Can't Escape: Darkness is a pretty interesting looking horror game that has a confirmed Linux release this September. I look forward to giving it a go!