Well, color me surprised. If they can pull it off, I will be genuinely impressed since the Call of Duty multiplayer games aren't exactly known for their huge player counts.
The Blackout mode will also, drumroll please, include zombies. Because of course. Though apparently, the locations for the zombies in the map will make sense and they won't be everywhere. For example, Nuketown being turned into Nuketown Island would have zombies on it. I guess that makes sense?
Let's see what other information has been pulled for Call of Duty: Black Ops 4's Blackout mode.
Vehicles
LandSeaAirWeapons
LandSeaAirWeapons
That is the gist of what we know so far.