Lyra Belacqua is an orphan who lives happily in Jordan College, Oxford, playing with local boys and terrorizing the professors. However, when Lyra overhears scholars discussing a plot against her uncle, Lord Asriel, centering around a mysterious substance called Dust, her curiosity is roused. Soon Lyra is in over her head as she uncovers a frightening plot and a whole new world of possibilities. (Source)
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This was a much longer trailers/preview than I had expected with almost 5 minutes worth of content. It did make the story make a bit more sense instead of just showing you pretty sceneries and pictures.
Looks like a must see for me.