The Hashira of Sound swears to protect the Demon Slayers and convinces Rengoku that the Superior Six will be dealt with.
Premium Crunchyroll users will get the premiere episode of Entertainment District Arc on Dec 5th; however, free users will have to wait until Dec 12th to get watch the episode.
Despite the fact that Demon Slayer does not provide a preview at the end of each episode in season 2, the anime does provide episode names ahead of time.