On a more shallow note: I always find it intriguing to see children grow up from movie to movie. Georgie Henley will be quite pretty, I think, and Skandar Keynes is suddenly all tall teenager-y.
And holy cow, William Moseley. He was handsome in the first one, but now? Gorgeous. It's a shame he's not going to be in the next one.
Seriously, this movie has a lot of (male) eyecandy for a kid's film. I approve.