When I saw Shaw shedding a tear in the trailer, my first thought was that it was a kneejerk reaction to getting her belief system shattered and simultainiously, the marvel of their discovery from a scientific viewpoint. She's deeply religious, seen praying and wearing a cross in the trailer.
I guess it's one thing to wonder and theorize about our origins and another to be actually standing in that chamber, looking upon the giant head statue.
I can't agree with myself whether the human/humanoid seen at the waterfall at the start, is actually the engineer/Prometheus on Earth or a human being after recieving the 'gift of fire' from the the engineer, meaning the gift is some technology on a biological level inside his body. What do you guys think about that shot?