Justice League Movie is CGI?

Happy Feet director George Miller is reportedly attached to the Justice League Film .Reports have said that the superhero team-up movie would include Batman, Superman, The Flash, Aquaman, Wonder Woman and the Green Lantern, that casting would start next week, and that Christian Bale (Batman Begins, The Dark Knight) and Brandon Routh (Superman, Superman: Man of Steel) would not be involved. IESB.net says that the movie might be a CGI/performance capture project, much like The Polar Express, and the upcoming Beowulf and Avatar.