Developer Kinetic Game put the patch notes up on Twitter, split into fixes, changes, and new features. The two most noteworthy points are part of the changes, where it’s mentioned that in professional difficulty, you won’t be told if ghosts only respond to groups or not, and that ghosts will now move to your last known location when they lose sight of you. In other words, you’ll need to do better than taking a sharp turn to lose a ghost that’s giving you chase.
Prison won’t always be available in the contract selection, nor will contract difficulty be random. Gamepad navigation on contract selection has been fixed, as has the ghosts boundary in prison. You can swap the sound to mono, the new lighting in school, asylum, and prison has been removed due to bugs, and localisation has been updated.