"Hardcover sales have been so strong that Ecco has put off issuing a paperback edition, which is now tentatively scheduled for the winter of 2025. Booksellers expect that “Remarkably Bright Creatures” will have another sales spike when the paperback is released and if a screen adaptation is made (a movie is currently in development with Anonymous Content and Clubhouse Pictures)."

https://www.nytimes.com/2023/12/30/books/remarkably-bright-creatures-shelby-van-pelt.html

Clarification: The title originally said released “to theaters,” but the nature of the release (theatrical or non) was not the intended essence of the question.