From Marvel Studios News:
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In addition to dropping the bombshell that Forest Whitaker has joined the cast as Zuri, Marvel Studios has confirmed three more actors for Black Panther. Winston Duke, who was previously reported to be part of the film, has now been confirmed along with Daniel Kaluuya (Sicario, Get Out) and Florence Kasumba.
Winston Duke is playing M’Baku, who is best known in Marvel Comics as the villainous Man-Ape. Marvel did not mention that name in the announcement and only described M’Baku as the leader of a rival Wakandan tribe. Wakanda, of course, is the fiction African nation which Black Panther (Chadwick Boseman) calls home and is now the king of.