User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-67.169.165.224-20130803194053/@comment-1263839-20130806115030

They either declare for that, or maybe they deem them irrelevant because as of Moon the characters are almost nothing like their Bios.

But they're still relevant, regardless of how careless Treyarch was.