Yep it actually exists! At the Siggraph Animation event producer Jon Landau revealed test footage for the sequel and the Hollywood Reporter breaks down the footage shown. http://www.hollywoodreporter.com/behind-screen/siggraph-avatar-2-producer-jon-592409. Most of it seems to be in early stages but "showed a notable advancement in quality" over the first film. I wonder how long it will be until this footage shows up online? Oh well head over to HR for more information.