"Following a huge victory for Best Actor at this year’s 92nd Academy Awards and the birth of his first child, Joaquin Pheonix is riding a wave of momentum into his next big role. As first reported by Deadline, the multi-faceted actor will reteam with his Gladiator director Ridley Scott in a new feature titled Kitbag. Pheonix will portray French military leader and emperor Napoleon Bonaparte...."
"“Kitbag” follows the rise of Napoleon and his demise from a deeply personal level, as we are also shown his long-lasting marriage to his one true love, Josephine. No other cast members are known at this time, but judging by the fact that Ridley Scott is directing and Joaquin Phoenix is headlining, this is going to be yet another major blockbuster that a ton of A-listers will want to be a part of...."
https://theplaylist.net/joaquin-phoenix-ridley-scott-kitbag-napoleon-20201014/
IMDB now lists more of the cast (including Ney and Davout) as the production is underway
https://www.imdb.com/title/tt13287846/