According to Deadline, it will be an as-yet-untitled sci-fi movie based on Edward Ashton's upcoming novel Mickey7, which will be released in February 2022.
Live, die and start again
Mickey7 is an Expendable: a disposable employee in an expedition sent to colonize the ice world of Niflheim. Whenever a mission becomes too dangerous, even suicidal, the crew turns to Mickey7. Each time he dies, his memories are implanted into a new body and his mission resumes. After dying six times, Mickey7 begins to understand the real purpose of his mission…
This is Bong Joon-ho's second project with Warner Bros, who has been working with Adam McKay (The Big Short, Don't Look Up) for a while on a mini-series adaptation of his Parasite movie.