There will be some exclusive DLC for those pre-ordering in the shape of the Operation Grey Wolf mission.
The PR describes the content, saying, "Hitler, Allied code name “Grey Wolf”, and his double have embarked upon a clandestine trip to the Libyan port town of Tobruk in 1942. In order to prepare for this mission, and that crucial final shot, OSS Agent Karl Fairburne must infiltrate the ancient streets and crumbling rooftops of the German-held town using stealth and distraction."
Featuring an expansive open environment, and randomized target identities, journals and locations, no two playthroughs will be the same. The question is – can you tell fact from fiction, the real target from the double?"