The changelog for upcoming patch 1.4. The new version should be out in the upcoming days.
Fixed duplicating depth orders
Atlantic campaign tweaks
Convoy rework convoys shouldn't disperse now after an attack
Destroyer appearance dates are bringed backed to historical dates
Fully destroyed eqiupment now is unrepairaible
Abdiel class minelayer listing bug fixed
New environment
Q-ships are removed because they were broken
Type IX uboat stern deck watch crewmembers were moved slightly moved back.
Now you can encounter u-boats more frequently when invasion of Norway occurs
Slight changes to Med Air bases
Lorient port traffic has been reduced in order to avoid crashes
New sensor values
Aircraft now should be detected at further distances
Aircraft now shouldn't appear in very high altidudes
Campaign and other tweaks made by s7rikeback (Big thanks to you!)
Underwater clarity has now been reduced to more realistic levels
20 new ships added from SH5 and World of Warships big thanks to Alex.B
1942 convoys have been redone. Overall ship count in convoys has been slightly reduced in order to increase stability of the game.
Tweaks to minefields (thanks to Salty Dodger for reporting it)