This seems more like a personal interest piece from a fan of Steinbeck's novel than a retelling of it. The media allows for viewers to see physical locations in a way that the original text could not but the end result is more of a documentary on the current condition of locations around the route than a retelling of the story itself. I would say then that this is a new work that investigates similar issues as the novel but is an entirely non-fiction doocumentation than a story.