The film (still in production) Watershed Movie formerly known as The River Red has posted a new trailer on their Facebook page here. They’ve finished recording the narration (by Robert Redford) and are well on their way to a release date.
The film hopes to raise awareness for the effort to restore the Colorado River Delta. The Colorado River has not reached the Sea of Cortez since the late 1990s and there is a movement to reverse that.
More Colorado River basin coverage here.