https://www.gamespot.com/articles/battlefield-1-in-the-name-of-the-tsar-dlc-release-/1100-6453024/

We finally know when Battlefield 1's new expansion is coming out. In the Name of the Tsar's release date has been revealed as September 19, though Premium Pass members will get two weeks' early access starting September 5.

Following In the Name of the Tsar's release, an Operations update will follow in October, with a standard update coming after that in November. December brings the third expansion, the "amphibious warfare"-centric Turning Tides. The fourth DLC pack, Apocalypse, focuses on "the most infamous battles" of World War I and launches in early 2018. If you haven't already purchased the game, EA recently announced and released Battlefield 1's Revolution edition, which packages the game together with its Premium Pass for US $60 / £55 / AU $90. Alternatively, the shooter is now available for free with EA/Origin Access on Xbox One/PC.