EA/DICE have announced the first DLC expansion for Battlefield 1. The new DLC is called "They shall not pass" and includes four new maps (set in France), a new game mode called "Frontlines", new vehicles, a new class and the Siege Howitzer.
The French army will bring more variation to the game with new weapons and vehicles. Additionally we will see four new maps and it looks like one of them will be quite similar to the "Operation Metro" you might know from Battlefield 4. Although there any precise date available it appears that the DLC is going to become available during March 2017.
Source:
Hexus