After launching Outbreak in Season Two, Treyarch promised that the large-scale Black Ops Cold War Zombie mode would eventually be getting its own Easter egg quest for players to advance the Dark Aether storyline. At next week’s mid-season refresh for Season Three on May 20th, that main Easter egg quest will go live, sending players hunting for new secrets across Treyarch’s biggest Zombies arenas yet. But that’s not all. Treyarch has also confirmed that a new round-based map is coming in Season Four, as well as another Main Quest for Outbreak, and even more Zombies content is being worked on for Seasons beyond.
Treyarch is notoriously secretive about Zombies content, allowing players to discover the wealth of secrets for themselves, but they did offer a quick overview of what’s coming next week: Black Ops Cold War Zombies May 20th Additions
New Content:

Outbreak

New Main Quest
Orda Encounter World Event
Fishing (!!)
New Intel Documents, Audio Logs, Radio Transmissions, and Artifacts to discover

Round-Based Maps

?Cranked 2: No Time to Crank? limited-time mode in ?Firebase Z? and ?Die Maschine?

Dead Ops Arcade 3

New Silverback Slideways bonus map

Onslaught (PlayStation Exclusive)

Onslaught Standoff map + new Intel
?Lotto Loadouts? limited-time mode
New challenge with exclusive Weapon Blueprint reward

New Features & Gameplay Improvements:

New weapons added to the Mystery Box and Trial rewards in round-based maps and Outbreak:

Groza a...