Though Valve's announcement makes no mention of what exactly these hats will look like, it does describe them as both "exclusive" and patterned after some element of Wolfenstein: The New Order. Whether that means historically inaccurate pickelhaubes or the combination helmet and gas mask worn by the grunts in this trailer remains to be seen, but, again, these are free bonuses so try not to look this gift horse in the mouth.
Alongside the newly-revealed gratis chapeaus, a pre-order of Wolfenstein: The New Order also grants players access to a beta of id Software's next entry in the hallowed DOOM franchise. However, as we mentioned earlier this month, that beta will only be available to those who pre-order Wolfenstein: The New Order on PC, PlayStation 4 or Xbox One.
Wolfenstein: The New Order (2/24/14)