[En Sabah Nerd]

To my understanding it's already been declared (and heavily implied by the trailer) that T'challa is dead going into this movie. It seems a sign of respect to Boseman's passing but it does also sting that the movies are just outright losing this character. Now with the movies leaning more and more into the outlandish fantasy seen in the comics we could technically see T'challa return in the future but I don't think we're quite yet at the point of the typical comic book convoluted resurrection that would allow for a recast. They could do an alternate universe version but based on the movies' current handling of the multiverse this wouldn't be a permanent replacement and just a guest role.

Obviously don't let me stop you from fan-casting and discussing the merits of actors.

They also revealed High Evolutionary for GotG 3, there wasn't a toy or anything (hence we didn't have people tearing that look apart here) it was just Chukwudi Iwuji in costume back during comic-con.