DC Universe Online Interview

Variety recently chatted up DC writer Marv Wolfman about the story progression, heroes, and villains we'll be exposed to in SOE's DC Universe Online.
Characters will remain true to their comic book alter egos, says Wolfman.

(If you're working with the Joker, he doesn't care about you he believes in chaos,) he says. (He could throw you in the thick of danger.)

It's not just low-level characters the Joker may screw over, either. He's just as likely to backstab Lex Luthor at some point in the game.

The idea behind (DCUO) is constant interaction with characters from the DC comics.

(You'll be constantly running into Superman or Batman or Wonder Woman throughout the game and that's just on the lower levels.)