The official Twitter account for ufotable released its first preview trailer for Demon Slayer: Kimetsu no Yaibai sequel film DEMON SLAYER -KIMETSU NO YAIBA- The Movie: Mugen Train. The film is slated to premiere 2020 in Japan.
— 鬼滅の刃公式 (@kimetsu_off) October 20, 2019
Demon Slayer: Kimetsu no Yaiba concluded its 26th episode broadcast in Japan. Towards the end of the episode, the ‘Infinity Train Arc’ was teased alongside a commercial announcing the sequel movie for the series titled Kimetsu no Yaiba: Mugen Ressha-Hen (DEMON SLAYER -KIMETSU NO YAIBA- The Movie: Mugen Train).
Haruo Sotozaki will be returning as the director of the film at animation studio ufotable. The trailer was released on Twitter.
— 鬼滅の刃公式 (@kimetsu_off) September 28, 2019
Aniplex of America describes the show as:
It is the Taisho Period in Japan. Tanjiro, a kindhearted boy who sells charcoal for a living, finds his family slaughtered by a demon. To make matters worse, his younger sister Nezuko, the sole survivor, has been transformed into a demon herself. Though devastated by this grim reality, Tanjiro resolves to become a “demon slayer” so that he can turn his sister back into a human, and kill the demon that massacred his family.
Demon Slayer: Kimetsu no Yaiba is currently streaming on Crunchyroll, FUNimationNow, Hulu, Wakanim, and bilbili in their respective regions. The TV anime series premiered this past April 6.
Source: ufotable Twitter
Edited 10/7/2019 for clarity and updated Twitter video. 10/22/2019 with preview trailer