As is often the case in these situations, the arrival of the first film reveals more about the second.
The films are titled Way of Feelings and Fate of Comrades respectively and according to flyers at AnimeJapan 2018 they’ll be called Peacemaker Kurogane: Belief and Peacemaker Kurogane: Friend in English-speaking territories.
The films are being directed by Shigeru Kimiya based on the screenplay by Eiji Umehara.