User blog comment:Nardragon/Justice League 2015/@comment-5064916-20121109001235

Batman, Wonder Woman, and Superman have been confirmed.

I'm almost certain that they will add Flash, GL, Martian Manhunter (or Cyborg if they do modern comics), and Aquaman

I could also see them branching out with Black Canary and Green Arrow (maybe not till the second film though)