UPDATED: I finally found something about this film, courtesy of Cineuropa:
Mati Diop's documentary Le retour (about the return of the royal treasures of Abomey in Benin, snatched away by colonial plunder, to a country that has had to build itself up and come to terms with their absence).
EARLIER: This came out of nowhere. In their Cannes preview, Les Inrocks claims that Mati Diop has a new film ready, it’s titled “Le Retour.” This is all news to me.
None of the trades have reported about this one. There’s nothing on IMDB. I even Googled it and couldn’t find anything about this latest Diop. Call it a major scoop from Les Inrocks.
There was socio-political and supernatural blending in Mati Diop’s Cannes-winning “Atlantics,” a bewitching film from the French-Senegalese writer-director.
After a successful jaunt in acting and directing short films, Diop returned to her native Senegal for her feature-length debut. It was also the first film directed by a black woman to compete in Cannes' main competition, where it was awarded the Grand Prix prize.
Edward Berger seems to have settled on what comes next. His Lance Armstrong biopic, starring Austin Butler, is now holding casting calls, with production eyed for January.