New item - Magic hat Conjures a magic hat to the ground, creating an area where everyone's backpacks and submarine parts are magically extracted without the need to travel to the submarine - especially valuable in co-op and higher difficulties.
Cardboard Fortress - Gamba The garage section of the cardboard fortress has been transformed and fully opened into a spin-2-win arcade aka inner gambler's wet dream. The Crab-o-mat and Wheel of Misfortune are waiting to bless you or harm you!
Asylum map changes The whole entry area of the Asylum map has been enriched - instead of 1 entrance into the map, you now have 3, allowing for better avoidance of enemies, eliminating the single biggest chokepoint of the map and faster access to multiple areas and pathways across the map.
Proximity madness
when players are too far from anyone else in the team for too long, their madness meter now continuously rises up
doesn't apply to single-player / 1-player sessions
Madness Bar UI
minimum madness threshold is now clearly displayed to avoid confusion when popping sanity pills
Balancing
rebalanced prices of shop items
reduced quotas for single players
increased quota scaling for each extra player
reduced quota for first difficulty by 20%
reduced damage and madness caused by enemies on first difficulty by 25%
Bugfixes
various navmesh fixes
cardboard fortress colliders fix
asylum interior & exterior colliders fix
asylum exterior grass hiding spots fix
various stuck SFX fix
Easter eggs
This one(s) you're going to have to find out yourselves.