According to a Tweet from SteamDB this year's Steam Summer Sale begins on 21.06.2018.

The now on Steam released update for Hitman prepares the game for the upcoming (15.05.2018) Definitive Edition and fixes some bugs:

HITMAN – May 2018 Update/Patch Release Notes (for all players)

For Tacoma, the current game of the developers of Gone Home, an update has been released on Steam, which adds over two hours of audio commentaries from the people behind the game:

Tacoma: Now Updated with Commentary Mode!

For the almost two years old stealth-game Aragami the Patch 01.09 has been released on Steam.

The patch improves the performance and prepares the game for the upcoming DLC Nightfall, which will be released in June:

Aragami - Patch 01.09

Hi there, shadow assassins!

It began as a Kickstarter campaign, and now it officially left the Early Access: the beat-em-up with the popular characters Bud Spencer & Terence Hill called Slaps And Beans is now available with a time-limited discount as full version for Linux on Steam!

FULL RELEASE IS HERE!
20. April - Trinity Team

The third and final (paid) DLC for the strategy game Dungeons 3 is now available for Linux on GOG and Steam!

FEATURE LIST

3 Campaign maps with audio
3 new Evil hubs
New Boss enemy: King Arcturus
New Wall Tile Set for the Dungeon

ABOUT THIS CONTENT

The strategy game War for the Overworld another huge free patch 2.0 as well as a new (paid) DLC called "The Under Games" has been released on Steam.

Both change and extend the main game in dramatic ways:

War for the Overworld 20. Apr.
The Under Games Patch 2.0 Released!

Darkest greetings Underlord,