EA and Origin Access subscribers can play Battlefield 1 early, although instead of getting access to the full game, you'll instead get to play on five maps over four modes, including St. Quentin Scar, Amiens, Sinai Desert, Fao Fortress and Suez in the Conquest, Rush, Operations, and Domination modes.
In addition to the above, you'll also gain access to the single player campaign, although again this will be limited to the Storm of Steel and Through Mud and Blood chapters.
Your progress will carry over should you decide to purchase the game, although EA Access isn't the only way to play early as you can also pick up the Early Enlister Deluxe Edition and play on the 18th.
EA says that once the Early Enlister Deluxe Edition is released the rest of the maps and modes will open up to EA Access and Origin Access subscribers. So it may be worth waiting until then, instead of using up your 10 hours early access beforehand.