Version 1.07c is a major re-working of the combat user interface and finishing of crew voices.
Major features:
Toolbars - contain buttons for just about every keyboard command.
Tooltips - reduce the need to memorise keys, making it easier for new players to get a handle on the controls of their submarine.
Set Course/Depth - controls to automatically bring your submarine to a specific heading or depth (including periscope depth).
Expandable Log - scroll through all messages received in combat.
Crew Voices - detailed crew voices with volume slider now available under Options.
To opt into the beta:
Right click Cold Waters in your Steam library, go to properties and you should have select the"BETAS" tab, then use the pulldown to select the beta you would like to opt into -leave the early access code empty- and the new update should download. When you run the game the version number should read version 1.07c.