Actress Sigourney Weaver, who played the role of Grace Augustine in "Avatar", says the shooting for the epic science fiction films sequel will begin in autumn this year. "We're starting. We're starting training, and we're starting -- hmm, I probably can't say anything. We will be actually shooting it by the fall," Weaver told hollywoodreporter.com. Earlier, director James Cameron announced that the scripts of all four "Avatar" sequels are completed and that stars Sam Worthington and Zoe Saldana were set to return alongside Weaver. However, he later said the second film won't be ready for a 2018 release date.