This is the short that District 9 is based on, directed by the same director. It gives you an idea of what it's going to be about, but then again so does the teaser. There is also a new teaser without the pixellated face and now with subtitles, because apparently people didn't understand what they were trying to get at with the first teaser.
It's the same trailer just without the blurred out face of the alien and now they subtitle him to say that they don't want to be here, but they can't leave because we have their ship and they mean us no harm.
There is also quite an ARG going, and if you like that stuff, as I do, here are some links to sites: