Developer Red Barrels has announced the release date of Outlast 2. It's coming out on April 25th for PC, PS4, and Xbox One and will be sold for $30. They announced it on Twitter.
"Welcome to Temple Gate. Outlast 2 will be available digitally on PC, XBOX One and Playstation 4 on April 25th." - Red Barrels (@TheRedBarrels)
They also announced Outlast Trinity, a disc collection of Outlast, Outlast: Whistleblower and Outlast 2. But unfortunately, it'll be available only for consoles. Reasons for the collection's console exclusivity is currently unknown.