Director James Cameron has spent more than a decade making the first of a planned four sequels to his 2009 blockbuster film Avatar. We got our first peek at the first of those sequels, Avatar: The Way of Water, in May with a brief, visually stunning teaser that showcased Cameron's undisputed skill at world-building. Yet despite enthusiasm for the visuals, the overall response was fairly muted. Perhaps more audience excitement for the upcoming film will emerge now that we have the full official trailer. As we've reported previously, Cameron wrote a treatment for Avatar way back in 1994, and it…