Sailor Moon Eternal Movie, Part I, has been confirmed to release in Japan on September 11, 2020. The movie will pick up from where Sailor Moon Cystal Season 3 left off. In other words, it will replace season 4 of SMC. The artwork has been updated completely, and more closely resembles the manga (or rather, a mix of manga and anime). Above is the official artwork for the movie. There's also a teaser video that was just posted to the Sailor Moon Eternal YouTube account. You can view it here. There are no information on release date for the US as if now.