Those keen on pre-ordering Battlefield 1 will be rewarded for putting their faith in the game early. If you grab it through Amazon, you'll be secured the Hellfighter Pack, which gives you themed items inspired by the Harlem Hellfighter infantry regiment (more information on these soldiers here) as well as access to a DLC map one week early.
If you're willing to pony up an extra $20 on top of the normal cost for the Early Enlister Deluxe Edition, you'll be granted the same deal as with Amazon, plus access to the full game three days before the public launch, five Battlepacks, a "Red Baron Pack", and finally, a "Lawrence of Arabia Pack" (if you haven't heard, Battlefield 1 takes place in Arabia, among other locales). The Early Enlister Edition can be had directly through Origin, the PlayStation Store, or the Microsoft Store. If you go with the PlayStation Store, you'll also receive a Battlefield 1 theme.
Battlefield 1 launches October 21.