James Cameron says that world's maximum earning science fiction film 'Avatar' will release on Christmas in 2017. Release in 2009 'Avatar' starring Sam Warthigton, Zeo Sldana, Stephen Lang and Michelle Rodriguez grossed over $200 crores worldwide. When asked about the sequel of the film, James said, 'Christmas 2017 is the target. We can announce this right now. But it is not so important by the fact that we have completed all the three films. Every film is completed in itself.'