Demon Slayer: Kimetsu no Yaiba the Movie: Mugen Train is an upcoming movie, as a Sequel of Demon Slayer anime series, Which aired from April 6 to September 28, 2019.
Following the Demon Slayer Anime episode-26 the movie was announced with staff and casting. It will be animated by the same Studio ufotable and will be distributed by Aniplex and TOHO. On April 10 the studio announced it opening date October 16 in japan Theaters.
Demon Slayer also gave us the one of the big hit theme song, sung by LISA named as Gurenge. Now its Officially announced that the movie theme song will also be sung by LISA named Homura (Flame).
A new key Visual is also released, which contains the villains of the movie as well as our hero Tanjiro.
Source - Official Website