It seems the artwork for Battlefield 5 has leaked ahead of its reveal and it looks very World War I.
Battlefield 5 artwork leaks - seems to confirm World War I setting
If you look at the fella's weapon in the image, it appears he is holding a Mauser knock-off. We are only basing that on the shape of the pistol. He is also holding a trench club.
The airship in the background also appears to be a zeppelin.
Battlefield 5 may contain an alternative WWI history due to speculation from earlier. We shall find out later.