http://www.traileraddict.com/trailer/super-8/teaser-trailer
Abrams has refused to reveal the plot of the film as he wants to keep it a mystery and let the images speak for themselves. What has been confirmed is that it will take place in 1979 and it will be a homage/tribute to Spielberg's 70's/80's sci-fi films with a mystery and supernatural feel from Abrams.
Within days of the official trailer release, several bloggers had already noted the presence of a viral campaign promoting the film including a single website extracted from what appears to be handwritten notes on the film stock in the trailer. This type of marketing campaign echoes similar campaigns used for Cloverfield in 2007.