The rights to making live action movies and TV shows of Miraculous has been bought by Skydance Media! Their first live action project of Miraculous (probably the movie) has an anticipated release date of 2020.
Skydance Media has been making popular movies, with titles like the most recent Mission Impossible movies and the Star Trek film series among their resume. They also have the live action rights to Sword Art Online, another series starring Bryce Papenbrook, though they haven't made anything yet, probably due to blase fan reception. It seems like they will make a pretty good Miraculous movie, though!