While LiSA (from the season 1 opening and the movie ending) is confirmed to reprise her singing for the upcoming Sword Art Online movie, Warner Bros. has confirmed that Maon Kurosaki and Yojiro Noda will team up to do the season 2 opening of Demon Slayer: Kimetsu no Yaiba.
Link:
https://www.reddit.com/r/DemonSlayerAnime/comments/pr1ayc/maon_kurosaki_and_yojiro_noda_will_duet_together/