Kingpin's rights are owned by SONY right now since he is considered a Spider-Man villain. Not exactly sure how THAT works.
If that's the case, that's kind of bullshit. However, since the Daredevil film was 20th Century Fox, I'm kind of skeptical that it's true. It just cements my belief that there needs to be a cross-over film. Have a Spiderman film, a Daredevil film, and a cross-over film.