Treyarch made a small update to Call of Duty: Black Ops 4 yesterday, announcing it on their official Reddit page. Just a couple of minor tweaks (see below or read about it on the post), but it was also communicated that today the Black Market will be live across all platforms. Per Treyarch, "...with Operation: First Strike delivering a stream of free cosmetic content to unlock in Multiplayer and Blackout, including new Signature Weapons, Gestures, customizable Outfits, Calling Cards, Tags, Stickers, Blackout characters, and more."
On Saturday, the free Halloween Event fires up across all platforms, with opportunities to earn seasonal cosmetics (i.e. Halloween stuff). Meanwhile, here is the list of the updates that went in yesterday:
Miscellaneous Updates (All Platforms)
Updates (PC)