Zombie Studios' Director, Jared Gerritzen, gave the release window to IGN.
The game is written by Jessica Chobot, whom you may remember as reporter Diana Allers from Mass Effect 3. The story centers around a woman making her way through an abandoned hospital using only her phone as a light source.
Given the procedurally generated nature of the game, it should be safe to assume that each play through will never be the same. This also means that the scares will also be random each time. The PS4 version will utilize the PS Eye (if you have it) to snap a picture of your face just as a big scare happens. Oh boy!