The upcoming paid DLC (free to Indiegogo backers) DLC for DreadOut has been detailed, releasing later this year: https://www.indiegogo.com/projects/dreadout#/updates

Key notes: 

• Takes place narratively in the game between a scene towards the end of the game where Linda gets pulled through a mirror, and before she awakens in front of the school before the final boss battle. Includes new narrative and cutscenes to fill in a new arch of the game's story.
• Features free-roam exploration and progression, with a variety of tasks to complete and locations you can explore freely. All locations from Act 0, 1 and 2 of the game are in the DLC, as well as all ghost encountered in the main game.
• Also includes two brand new levels that was neither in Act 0, 1, or 2.
• 10 new ghosts with newly designed battles, 8 of them helped designed by highest-tier Indiegogo supporters.

Some images teaser :