We know Sony has been working on an "Amazing Spider-Man" spin-off film featuring the "Sinister Six," a kind of 'Avengers' of villains from the Spider-Man comics. During the end credits for this year's "The Amazing Spider-Man 2," we also saw sketches that seemed to reveal who these bad guy are - Green Goblin, Doctor Octopus, Rhino, Vulture, Kraven the Hunter and...