Previous trailers and clips have tended to put the emphasis on the apartheid aspects of Neill Blomkamp's District 9: The aliens are segregated and mistreated by a populace resentful of their presence. That's a theme in the new featurette too, of course, but here we also get a closer look at the central figure in the human side of the drama, Agent Wilkus, played by newcomer Sharlto Copley.
Wilkus has been infected by a mysterious virus that is changing his DNA. At the same time, it's gradually begun to dawn on him just how seriously the aliens are being mistreated, and he is determined to put a stop to it. These threads combine to throw him into the very center of events. He goes, as producer Peter Jackson puts it, "from being a nobody to being the most valuable person on the planet."