Changelog, as far as i remember:

-Updated VFX for all explosive weapons, and the explosive barrel.
-Added a toggle for the exploding drum.

-Updated a few powerups, visually and functionally:
-Blursphere now fully suppresses all your weapons.
-Soulsphere gives you 50 Health and Regeneration.
-Megasphere gives you 100 Health and Regeneration, and repairs your Armor if you still have one.
-Backpack now extends your armor capacity, as well.
-Berserk halves the damage you receive, while doubling your melee damage.

New powerup: Health Booster
-Increases your health cap by 10% with each pickup. Randomly replaces Berserk/Blursphere.

Armor re-worked:
-Bonuses stack on top of your current armor limit by 50%.
-Armor split between Light Plates and Heavy Plates.
* Without the Backpack you can hold 1 Light and 1 Heavy (or 2 Heavy).
* With the Backpack you can hold 2 Light and 2 Heavy (or 4 Heavy).

-New item: Grenades
* Grenades are deployed with User 1, and explode into shrapnel.
* Tap the User 1 button for an underhand throw.
* Hold the User 1 button until the grenade number in your HUD turns teal for an overhand throw.

-New P90 Altfire: Laser Sight
* Turns on a red dot sight and sets the gun to semi-auto, tightening accuracy at the cost of firerate.

* Added all kills/all secrets notifications.
* Added new level start intro.

Right now, it's only the main version getting updated, but eventually, down the line, i might finish the Zandronum update.