In an interview with MTV, Marvel Studios co-president Louis D'Esposito was asked about a potential Black Panther movie, and this is what he had to say:
"He has a lot of the same characteristics of a Captain America: great character, good values... But it's a little more difficult, maybe, creating [a world like Wakanda]. It's always easier basing it here. For instance, 'Iron Man 3' is rooted right here in Los Angeles and New York. When you bring in other worlds, you're always faced with those difficulties."
So, let me get this straight - it's apparently not-so difficult to create the fictional worlds in Thor, or the upcoming Guardians Of The Galaxy (with its bizarre team of interstellar heroes), but Wakanda will be more of a challenge? I hope that's not what's holding up a Black Panther movie.