User blog comment:KATANAGOD/Treyarch Teases Zombies (again!) on twitter - In-game Screenshots this time around/@comment-2.223.205.34-20120920061958

Okay, so the post and picture:

I'd say the 'They' he's reffering to in the Tweet is actually the four characters, not the zombies. My reasoning is simple- he says the calm is over, but now the four characters are back on Earth Richtofen has someone to go for.

Whether i'm right or wrong, rollon next Wednesday! :D