I wish I was at New York Comic con.
In an article by IGN, IGN get a look behind the show Young Justice. Article here: http://tv.ign.com/articles/112/1126674p1.html
In the article, it goes in to questions and answers about what Young Justice will be about:
A preview of Young Justice is due to premiere next month, while the season premiere will be around January next year. What are you guys thoughts? I was already hyped up about it when I heard about this show at Comic Con, and I'm even more hyped now. Greg Wesiman did a spectacular job on The Spectacular Spider-man and I can wait to see how this show comes about.
-- The Justice League aren't in the show "a lot a lot." Batman is around to hand out missions and Red Tornado is kind of like the kids' den mother, while Black Canary is in charge of training them.
-- Captain Marvel will hang around with the group since he's secretly a 10-year-old kid.
-- "Secrets and lies" will be a big part of the show. The Justice League is keeping secrets from Young Justice. The kids are keeping secrets from each other, and even from themselves.
-- Dick Grayson's identity is secret, though he does tell Kid Flash. But don't tell Batman that he did.
-- Will we see Wondergirl or Captain Marvel Jr.? The producers are staying quiet now, but you can expect over 150 DC universe characters to show up in the first 18 episodes alone.
-- Speedy's membership in the group is unclear. "Watch the first episode."
-- Going with Wally and Dick was in keeping with the whole concept of portraying the early years of the DC world.
-- The show will be dark, but also expect a lot of humor and romance. Joss Whedon's work is a big influence.
-- There is "tremendous significance" to the ice theme of the villains in the clips screened.
-- There are no embargoes from the studio on any characters, though at the beginning of the series there were four characters they couldn't use. That's no longer the case.
-- The producers heavily hinted that the Wonder Twins might show up.
-- Jay Garrick will show up, meaning that there was a Golden Age of superheroes in this world.
-- Characters will age.
-- The producers have great hopes for the toys, bed sheets, talking banks and so on that will be based on the series.
-- The technology won't be too far advanced beyond what exists in reality.