So there's rumors that The Eternals will make its debut at Cannes in July stemming from a comment made in variety from one of the people who runs the festival who said that there will be a "planetary blockbuster" debuting at the festival.
I think it's more likely that they are referring to Dune, however. It'd be a pretty early debut, especially for a Marvel film.
The Cannes artistic director on his selection process, changes to the fest and the state of talks with studios, filmmakers and Netflix.
variety.com