True to their word, Blizzard has released the Overwatch update 3.20 patch this October 26, and this renames McCree to Cole Cassidy! This patch also brings in bug fixes to other heroes which are listed in the patch notes below.
Overwatch Update 3.20 Patch Notes | Overwatch October 26 Patch Notes:
HERO UPDATES
Cassidy
- Introduction of new hero name.
BUG FIXES
GENERAL
- Fixed a bug that caused players to not receive full credit towards matches played when playing Junkenstein’s Revenge
HEROES
Brigitte
- Fixed a bug that caused her mace chain to appear as the wrong color in highlight and emotes if the Vampire Hunter skin is equipped
D.Va
- Fixed a bug that caused the Black Cat skin to have a missing decal on the golden gun
Mercy
- Fixed a bug that caused the Valkyrie ultimate ability outro sound to not play properly in both first and third person
Soldier: 76
- Fixed a bug that caused the Grillmaster highlight intro to be unavailable
That seems to be it. There is an on-going Halloween event, which you can read about here.
Source: Blizzard forums