Amplitude Studios celebrates having sold 300,000 copies of Endless Space, their 4X strategy game (which happens to currently be on sale on Steam) with the release of a new update that includes the game's fourth free DLC. Steam News has all the details on the new version, and here's the big picture:

The new add-on will bring new content designed or voted by the community such as mysterious heroes, gameplay elements gravitating around asteroids and gas giants, new escalating random events, AI improvements, and several other additions.