One of the biggest and most successful 3D-movies, 2009’s Avatar, will have three sequels. This was announced by 20th Century Fox and James Cameron (who, just in case you didn’t know, was the director of Avatar).
Talented screenwriters Shane Salerno, Josh Friedman, Rick Jaffa and Amanda Silver have all agreed to be a part of this huge project. The second, third and fourth parts will be produced by James Cameron and Lightstorm Entertainment. WETA will be in-charge of the special effects this time as well.
Also, the second part (Avatar 2, perhaps?) is set to release in December, 2016. The third and fourth parts will release in 2017 and 2018 respectively.