We're about to start getting a flood of information on " The Avengers: Age Of Ultron " as they cast the remaining roles, and I'm curious to see how Marvel handles things. There are plenty of surprises left to be revealed, and major characters that haven't been mentioned at all yet in public, and I have no idea how they're going to reveal things. Will they say who they're casting these people to play, or are they going to be coy about it for as long as possible? And if they do try to play it low-key, how successful are they going to...