User blog comment:Argorrath/Treyarch releases a BO2 teaser video called "Origins" for DLC 4/@comment-190.51.100.175-20130808033717/@comment-11037376-20130808063651

Nikolai must have gotten exiled to Northern France, as the letter is his, and it states a person with words like 'my' and stuff. Also, the robot could be called the Kaiser's War Machine, as the letter is saying.