The Avatar sequels will be produced by James Cameron and Jon Landau through their Lightstorm Entertainment.
The Hollywood Reporter brings word that former Game of Thrones actress Oona Chaplin (Talisa Maegyr, the brief wife of Robb Stark in the series) has joined the cast of the four upcoming Avatar sequels.
Released in 2009, the first Avatar film remains the highest grossing film worldwide with over $2.7 billion in box office gross.
The James Cameron-directed sequels are written by Cameron along with Rick Jaffa and Amanda Silver, Josh Friedman, and Shane Salerno.