George Miller to lead 'Justice League' WB moves ahead with bigscreen adaptation By DIANE GARRETT / Variety Warner Bros. is moving aggressively ahead with the bigscreen adaptation of DC Comics� �Justice League of America,� with George Miller on board to direct. Project, which is the initial phases of casting, is a pre-strike priority for the studio, which needs a superhero tentpole in 2009. Still, making all the pieces fit has been complicated by overlapping superhero projects in the pipeline, since �Justice League� features a pantheon of superheroes, including Superman and Batman. Batman and Superman are active properties for the studio, though the next installment in the Superman franchise has taken a backseat to �Justice League� in part because Warners is so keen on the �Justice League� script by Kieran and Michele Mulroney. �Justice League� will likely feature the characters of Superman, Batman, Wonder Woman, the Flash and Aquaman. Warners is in the preliminary phases of casting for �Justice League.� Several sources close to the project said that Christian Bale, star of the revived Batman film franchise, and Brandon Routh, star of Bryan Singer�s �Superman Returns,� would probably not appear in the movie. However, helmer Chris Nolan, current steward of the �Batman� franchise for the studio, would prefer that Warners delay �Justice League� until after he finishes �Batman� projects in development; Bale has also let his uneasiness about �Justice League� be known. To work around these issues, the studio explored making �Justice League� as an animated film or with motion capture, but all indications are that the film will be special-effects driven live action. The project is so complicated -- and casting dependent -- that even those deeply involved in the project are holding their breath until production begins. �They�re working very hard to get it to happen,� said one party close to the project. �But there are so many characters it�s complicated.� It was for this very reason that many believed Warners would move ahead first with a follow-up to Bryan Singer�s �Superman Returns.� Singer, however, is busy with Tom Cruise starrer �Valkyrie.� Miller has a warm relationship with Warners. He last helmed �Happy Feet,� which generated $379 million worldwide box office for the studio.