Back in May, South African film producer Anant Singh revealed during a radio broadcast that Marvel Studios was interested in shooting Avengers: Age of Ultron in Cape Town, South Africa. With shooting scheduled to begin in London this March, it seems Marvel has also been given permission to shoot in Cape Town, since the production added South African extras casting coordinator J.P. van der Merwe to the crew, according to the sequel's IMDB page.
Of course, it still isn't known what may be shot in South Africa, but this adds to the growing speculation that the African superhero Black Panther, a.k.a. T'Challa will be included in the story. Back in April, Morris Chestnut teased that he was "getting familiar with the Black Panther character," revealing the next day that the character may be in Avengers: Age of Ultron. T'Challa hails from the fictional African country of Wakanda, which is where the rare metal vibranium is found, the material used to make Captain America's shield. In one version of the Marvel comics, Ultron himself is actually made of vibranium, so it's possible they may use that detail in the sequel.
It's possible that T'Challa may make a brief appearance inAvengers: Age of Ultron, to set up the Black Panther movie that Marvel has been developing. However, with a large primary cast, including actors from Marvel's The Avengers and new additions such as Anthony Mackie (Falcon), James Spader (Ultron), Aaron Taylor-Johnson (Quicksilver) and Elizabeth Olsen (Scarlet Witch), many believe that there simply won't be enough room to fit him into the story.
Director Joss Whedon previously revealed that the sequel deals with, "[the team's] place not only in America but in the world," although there is little that has been confirmed about the story, aside from the cast of characters. In related news, cinematographer Ben Davis (Guardians of the Galaxy) is taking over director of photography duties from Seamus McGarvey, who is shooting Fifty Shades of Grey. Joss Whedon brought him on board after a recommendation from Guardians of the Galaxy director James Gunn.