The film is about Green Lantern, Green Arrow and others of the Justice League of America, an organisation made up of the world's greatest superheroes. They must deal with the expulsion of Batman and the death of Superman at the hands of the monstrous Doomsday (EntertainmentNewsDetail)
Really? That would be awfully dark for a superhero flick, but a story I would love to see. The Doomsday arc is a great story... but it has recently been done as an animated film. Would DC allow the story to be filmed twice so close together? Maybe.
I have to wonder if with the recent Batman related tragedy, that could be the reason they would drop such a popular character from the League.
Rumors are rumors, but it is interesting to think about.
BTW: Comics2Film is reporting that the release has been pushed back to 2010. Sounds like a lot of retooling to me.