The release build is now available with all previous Beta fixes/updates, along with these changes:

ADDED
New firearms! Introducing the ND-2000 and NM46 (plus shock variant) smgs, AN74b and Eraser rifles, and the Model 23 Surplus pistol. Plus, a new line of Cryo-Gun weapons and an Acid Blaster at the Arena Blackmarket vendor!
Threw some holiday lights up in the Crackpot boss room to give the whole place just a friendlier vibe

FIXED
Hair was still showing through some background characters' hats, and in some cases, wasn't showing at all when it should (such as when wearing a radio headset or a headband).
A ramp ledge in the Base Jumping stage was allowing enemies to leap off the ramp and stand up on top of some scenery, where shooting them was very difficult.
The end credits for Story Campaign had a MERC Sniper whose hat loved to change color randomly.
A "do not teleport here" area blocker in the Crackpot boss room would make characters look like they're floating.

TWEAKED
Retiring a controller now only takes Right+Left Bumpers to be down when pressing Start. The Back button was getting intercepted by Steam during remote play, which prevents players from quitting.
You can also retire a joystick/controller by clicking on it in the Pause menu.