Currently there is no public information that there will be any new DLCs added to BF1. Stay tuned to official channels however for any updates because if something new does come up, it will be first shared there.
Additionally, if you have possible feedback about BF1, be sure to also submit it here: https://forums.battlefield.com/en-us/ . And do note that DICE is not done yet with BF1 so there is more stuff coming, just for now its unsure if there will be more DLCs etc.
