Charles Roven who’s one of the producer of the DC Extended Universe, updated on James Wan’s script for the Aquaman movie in an interview with Collider, confirming that Wan is working document from which to write the script for the film at the time of the interview.
“We’re very early days. We’re just starting with the screenplay. He’s making The Conjuring 2 now, so he’s had his hand in the creation of let’s just call it a working document from which to write. But he’s directing that film [and] he’s got his hand ever so slightly in the development, but he’s really gonna throw himself into it after he finishes shooting Conjuring 2. And we’re planning on it being his film after Conjuring 2. He is a serious Aquaman fan.”