At one point in the interview, the subject of film genres was raised, and Rose asked him "what type of movie did really want to make?" (or something along those lines.) QT said that he loved working in genres, and enjoyed trying to work within their conventions, while adding his own mark. (again, paraphrasing here)
Although he didn't actually say he wanted to make a cape movie, that interview added to my belief that he will someday try his hand at the superhero genre- most likely, characters of his own creation. Time will tell.
Image: Quentin Tarantino- used by permission, Charlie Rose LLC