In an interview with 9 director Shane Acker: "I think there is definitely room. I mean, the way we end the film, there is a slight suggestion that it may be a new beginning. And I think we could continue the journey from where we left off and see how these creatures are existing in a world in which the natural environment is coming back and perhaps even threatening them in some way. Do they make the decision to not affect it, or do they try to affect it in some way? And do they still try to hold on to that humanity within them or do they recognize themselves at being machines too and go off on a different trajectory? So there's lots of idea that I think that we could play with and make another story out of."
The possibilities for a 9 sequel were made in the film's DVD commentary. Director Acker has also mentioned the possibility of a sequel being made because of the lack of darker animated films, claiming that everything is G- and PG-rated with little to no dark elements.
In 2009 he said that he will continue to make darker animated films, either doing so with a sequel to 9 or original ideas for future films.
Acker and Burton stated that we’re open for a sequel, depending on how well the film was received.
Why It Was Cancelled