User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-3967954-20130731213726

Well, one of the images Treyarch posted on Twitter showed the blueprints for a Mauser C96 pistol with a few steampunk-y modifications, so I guess they're adding weapons from the time period. Or just one. I'd like to see some bolt-action rifles in there, though.