According to Entertainment Weekly, the Maleficient actress is in talks to star in the upcoming Marvel Studios filmThe Eternals, about the endless lives of beings who were part of a genetic experiment that also created life on Earth. In Marvel lore, the Eternals were ridiculously beautiful godlike beings created by the Celestials as a force for good - and if you can't remember what the "Celestials" are - think back to Guardians of the Galaxy - it's the mining city of Knowhere, which was also referenced in Infinity War.
Nothing is confirmed, obviously, because we don't know the outcome of Avengers: Endgame, we just know that we don't want any of the fan favorites to go away, yet, we know some will.