Yes, "Demon Slayer: Mugen Train" is both a movie and an adaptation of the Mugen Train arc from the "Demon Slayer: Kimetsu no Yaiba" manga and anime series. The film follows the same storyline as the arc, focusing on Tanjiro and his friends as they battle a powerful demon aboard the Mugen Train. Released in 2020, the movie is a continuation of the anime series and features high-quality animation and action. It also covers events that occur after the first season of the anime.

As of now, there has been no official announcement regarding the release of the "Demon Slayer: Infinity Castle" arc in 2025. The series is known for adapting arcs from the manga, and the next installment is typically anticipated after the conclusion of current seasons or movies. However, the exact timeline for future adaptations, including the Infinity Castle arc, has not been confirmed. Fans are encouraged to stay updated through official channels for any announcements regarding the anime's future.

"Demon Slayer: Infinity Castle" is not a movie; it refers to a significant arc in the "Demon Slayer" manga and anime series. The film that precedes it is "Demon Slayer: Mugen Train," which was a massive hit, becoming one of the highest-grossing anime films of all time. It follows Tanjiro and his friends as they battle a powerful demon on a train. If you’re asking about the continuation of the story in the anime or upcoming adaptations, it's highly anticipated by fans, but specific details about its success will depend on future releases.