Forgot to mention this a few days ago but the official District 9 trailer has been released:

http://www.youtube.com/watch?v=ZSgLOvH_MMk

::edit::

Another version of the same trailer can be found here: http://io9.com/5243114/the-face-and-translated-words-from-district-9s-alien-interrogation?autoplay=true
This version has translated speech (for the individual being interrogated) and unblurred face to reveal what they will look like