This Super Monday Night Combat update is tagged as Rule Change 33 on the patch notes page:
Free Pro Rotation: Assassin, Assault, Cheston, Megabeth, Support, Veteran
GG Stack: Great update, almost good as my Outland grandma!
For this update we’re releasing the first set of user created content created by fans for fans. A big thanks for everyone that contributed! We’re also drastically lowering the price of all Pros and introducing a very affordable bundle that includes all the Pros and some content for those Pros. As always, feel free to leave us feedback at http://forums.uberent.com! If you have issues please email email@example.com.
The current version is: 45269. If you don’t have this version, please restart your game.
Drastic reduction of Pro and Boost prices across the board
Added support for Pro Rotation server side that doesn’t require a patch to update
Reduced price on Treasure Ball Key, Spunky Key, and added new Pallas Treasure Ball
Fix error when applying flair without particles.
New Bundle: All Pros – All Pros plus Blitz Uniforms, weapons, and taunts for each one.
Red S.A.D. Disguise: Created by araxisht
Black S.A.D. Disguise: Created by araxisht
The Cinnamon Stabber: Created by imvudude
Spunky Saber: Created by imvudude
Mega Milk Beth Uniform: Created by goodbean
Weight of Terror: Created by araxisht
The Beat Seat: Created by jbeetle
The Lone Griller: Created by kazzymodus
The Key (To Your Heart): Created by csx
The Bacon Beater: Created by imvudude