Why, you ask? The studio wants tax breaks for shooting in Australia, and got no response to their proposal. They also weren’t fully satisfied with the script, and wanted some more help with it, but the current writers’ strike leaves their options to drooling Justice League fanfic writers, which is not a good idea. Plus, the film is in a sorry state with the writer’s strike already, but their SAG deal expires in June, and the movie needs to be completed by then!
As far as the cast goes, most of the cast should still be available for the planned late summer-fall production. The cast itself, for those not in the know, will feature Arnie Hammer as Batman, Megan Gale as Wonder Woman, Adam Brody as The Flash, and (rumors follow) Scott Porter as Superman, Common as Green Lantern and Teresa Palmer as Talia al Ghul.
The repercussions here are that we are in a shortage of superhero flicks. The Dark Knight, the show-stealer is coming out this very year, while a Superman sequel’s fate is currently unknown. The inevitable Spider-Man 4 will take a while. That leaves us with the new upcoming Hulk movie and the planned Captain America movie. Okay, maybe not even that less, but hell.