The floodgates on next summer's Marvel blockbuster, Iron Man 3, are set to open later this month when Marvel Studios president Kevin Feige takes the stage at San Diego Comic-Con to talk about the film. Before that happens, however, Marvel is opening the faucet ever so slightly by releasing a concept image that's sure to get fans talking. Directed and co-written by Shane Black, Iron Man 3 has long been rumored, but not yet ...