The Blender Foundation has released over 4 terabytes of Ultra-HD footage from Tears of Steel under a CC-BY license. Their previous movies have all become standard demo material for HD equipment, and I'm convinced you will see this footage everywhere in the Ultra-HD market this year.
Ton Roosendaal writes:
Thanks to our friends at Xiph.org we now can offer everyone access to the original source footage of Tears of Steel.
You’ll find something like 80,000 frames, each in OpenEXR half float files, in 4096 x 2160 pixels. This is 5 times more footage than used in the film, including unused shots, but mainly it’s because of long lead-in and lead-outs, and of course we’ve been cutting shots sharp.