Avatar - Extended Collectors Edition | (2009) 1080p

According to technical reviews from Blu-ray.com and High-Def Digest :

The in 1080p is a comprehensive three-disc Blu-ray set released in 2010. It is widely regarded by enthusiasts as the definitive high-definition home release of the film due to its inclusion of three separate cuts and over eight hours of supplemental material. Movie Versions (Disc 1) Avatar - Extended Collectors Edition (2009) 1080p

Includes approximately 8-9 minutes of additional footage, including the "Sturmbeest Hunt" and expanded battle sequences. According to technical reviews from Blu-ray