Denzel Washington. The director said during the "7PM in Brooklyn" podcast (in the below video) that Washington will in fact be part of "Black Panther 3," should that movie ever happen. Washington previously let it slip in November 2024 that Coogler wrote a role for him;

Few movie studios are quite as secretive as Marvel. The MCU is a major franchise, and the attempts to keep spoilers from leaking are quite significant. This made it more than a little wild when Denzel Washington just came out and said he would be in Black Panther 3, a movie that Marvel had never even confirmed it was making.