"It will be Jake and Neytiri together. There will be other characters that come in, both on the good side and on the bad side. We will explore parts of the world you haven't seen before. It will be fun and adventurous."
Cameron has worked alone in writing the new script and that for a third film, but sounded doubtful when asked if the follow-ups would be as revolutionary as the first.
"That might be tricky because we kind of reinvented the wheel (with Avatar)," he said.
"Now it's more refining the process. The story will be completely new and fresh, and there will be fresh characters and environments and creatures and all that but the actual methodology, it was kind of a one-time revolution."
In addition to another screen production, the duo plan to recreate Avatar across a variety of forms, including a series of novels.
"The novel is something that will unlock the door for us to enter into other ancillary markets, whether it be graphic novels or television animation or whatever it is," Landau said.
"We think that entertainment today goes beyond any one medium and with Avatar we have an opportunity to continue to expand and tell the story of the world."
Part of the franchise will include a Walt Disney theme park.
"Not just a ride, but a whole world, where people will get to return to Pandora,'' Landau said of the Florida facility which has been rumoured to open in 2015.
Cameron and Landau would not speculate on a release date for the second film.
- AAP