I prefer a film to be mysterious. The whole point of Cloverfield is that you are in the same shoes as the people it is happening to, if we found out exactly what it was then it would ruin the whole concept. I think this is awesome though, happens in the last part of the film when we watch their home video - http://www.youtube.com/watch?v=uRPxHk8GArI, really adds to the mystery.