User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-76.98.124.201-20130804153240

If the map is to be set during WWI, there's no way it could be the old crew. The letters are dated 1917, 28 years before the events at Der Riese. The crew just seem too young to fit that timeframe... Maybe it's just me...