The first expansion pack for Battlefield 1 released at the end of March, bringing French Army faction, four maps, new vehicles, a new Elite Class, weapon, and a new game mode (on top of that, there was a free mandatory patch that released at the same time).
The expansion fell under the Premium Pass, which was detailed to be bringing yet another army faction to the game in a second expansion pass (the Russian Army Faction). The Premium Pass has been detailed to include four expansion packs in total, which means we know the factions for the first two packs.
During a recent call, EA suggested that they will be bringing even more factions to the game in coming expansions.
“Every Battlefield 1 player will have more ways to play throughout the year, with continual game updates, new maps, and three more expansion packs adding new armies, regions, and battlegrounds available to the whole community,” said EA CEIO Andrew Wilson during a recent call with investors.
“We’re just getting started with our live service plans for this massive game, and later this year, we’ll introduce new ways for players to get an even bigger Battlefield 1 experience.”
Note that Wilson said "armies" and not army. The question is, which factions will be added to the game after the Russians? The next three expansions have been given light details:
In the Name of the Tsar
Enter the war's biggest front with the Russian Army and fight in snow-covered ravines and a freezing archipelago in 4 new maps.
Turning Tides
Participate in the amphibious warfare of WWI and engage in the daredevil Zeebrugge Raid, the Gallipoli Offensive, and more.
Apocalypse
Go over the top in the most infamous battles of WWI. Conquer the bitterly contested ground with brutal tools and unique weapons.
The Gallipoli Offensive had the British Empire, along with France and Russia, facing off against the Ottoman Empire, who was supported by Germany and Austria-Hungary.