A patch for Wasteland 2: Director's Cut has been released today which adds the long-awaited modding support.
Detailed information can be found in the official mod support guide.

Punch Club, a mix between Fighter management sim with RPG and tycoon elements and interesting Story, is now available for Linux on Steam.

Description:

Train hard, fight crocodiles and find love. Earn your place in the Punch Club ranks, and discover who brutally murdered your father, in this choose your own adventure boxing management tycoon.

SteamDB currently reports heavy caching-Problems at Steam.
This leads to some information disclosure, like users seeing profiles of other users (incl. all games and personal data).

There is currently only one solution: DO NOT USE STEAM, and don't try to change personal data (adress, paying informations aso)!

Blues and Bullets: Episode 1 is now available for Linux on Steam!

At the same time, the developer announced the upcoming release for the second episode for Linux at the same time (or extremely close) to the release for all other platforms.

Here is the official announcement on Steam:

The Steam Winter Sale 2015 has begun!

Here is a (currently incomplete because still updating) list of the current discounts for Linux games (from https://steamdb.info/sales/?displayOnly=all&category=999&cc=uk):

Silently creeped Total War: ROME II - Emperor Edition in my Steam-library a few moments ago!

I'm currently downloading the 13.3GB, and will report here soon, if it really works!

UPDATE: currently there is sadly no executable file, so the game won't start.

Valve confirmed to the makers of the nvidia-PPAs for Ubuntu, what users of the current Beta-Nvidia-Driver 358.x for Linux do already know: the Beta-Driver is responsible for an unusual hight count of crashes when used within the Steam-Client.