Avatar - Extended Collectors Edition (2009) 1080p Instant

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

This disc uses seamless branching to offer three distinct ways to watch the film: Avatar - Extended Collectors Edition (2009) 1080p

The version seen in theaters in December 2009. According to technical reviews from Blu-ray

The longest version, adding 16 minutes to the theatrical runtime. It features an exclusive alternate opening on Earth that provides deeper context for Jake Sully's life before Pandora. Technical Specifications Avatar - Extended Collectors Edition (2009) 1080p

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)