Black Panther did wonders at the Box Office, and it was one of the most successful Marvel movies so far. And Marvel Studios greenlit a sequel, because we need it. And Kevin Feige, Marvel Studios president, recently confirmed who will not return for the sequel.
Marvel Studio
And it seems that Killmonger, played by Michael B. Jordan, and Nick Fury, played by Samuel L. Jackson, will not be a part of the second Black Panther.