User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-71.197.43.36-20130805144538/@comment-71.197.43.36-20130806133734

Except for the fact that they're accepting if you agree with your theories, or you're blocked. And no, their videos are not 'proof' for me because it's all cryptic, and it's in no way direct. Little tidbits of random shit is not proof.