This time next year (October, 2014), Avatar will begin filming.
Sam Worthington confirmed what previously begin as a rumor, last week during a radio interview.
Worthington also said that the majority of the script for the sequel has already been written.
James Cameron is the writer of, as well as, the director of Avatar.
When filming begins next year, production plans to shoot the scenes for sequel two, three, and four.
Screenwriters were hired to help collaborate the screenplays for the sequels to follow.