I've read all the books - and from the looks of the trailer it's going to be quite true to the books - the actors seem to match the mental images I have of the characters quite well. I'm going to see it as soon as I can because I love the stories (even though I'm old enough to know better) and because much of the film was made in the North East of England where I'm from - there are even scenes shot in Durham Cathedral just over the road from my uni. I've even got a 15 year old brother who's feigning teenage apathy, but says he's going to go and see it.
However, with the course I'm doing at the moment - I have the perfect excuse for going, it's just for my course - honest!