https://www.gamespot.com/articles/call-of-duty-black-ops-4-zombies-mode-teased-again/1100-6458843/

Activision will finally pull back the curtain on Call of Duty: Black Ops 4 in just a few days, but in the meantime, developer Treyarch continues to drop hints about the game on social media. This time, Treyarch sent out a cryptic tweet that again seems to confirm Zombies mode will return in this year's Call of Duty.

The tweet, which you can see below, simply reads, "So it begins..." and is followed by "#Zombies." However, the most intriguing aspect of the tweet is the accompanying image, which shows what appears to be a zombie-like character putting on a mask, with the words "Mankind's reckoning will be its salvation" lining the bottom of the image.