"Marvel's The Avengers" is hitting screens everywhere in three weeks. This past Wednesday, the film had its big Hollywood premiere, and after the screening Twitter was ablaze with positive comments from those who saw it. (Full disclosure: I was there and it is indeed awesome.) But is the movie really finished, or are the Avengers assembling one last time? On Thursday the cast came together for a press conference in Beverly Hills, and Robert Downey Jr. let it slip that the superhero group might not be done saving the world. At the end of the event, Movieline reports Downey stated, "Not to keep you guessing, but we're actually not done shooting. We are shooting one more scene... tonight. Not kidding." He followed it with a curt "No more questions!" and the panel ended. Many of the gathered journalists assumed that Downey was joking. Earlier in the press conference, after giving a heartfelt response about working with his costars, ...