It might just be because I was so much younger when I read the Narnia books for the first time (I didn't read Tolkien until college), but I, too, am far more attached to Narnia than I have ever been to Middle Earth.

The first movie pleased me so much, with both the look of the world and the feel of the characters, that I'm willing to cut the other movies in the series a little slack, at least for now. (Although bringing Peter and Susan back would squander most of that credit, I'm afraid.) I'm also bothered by the lack of Eustace in this trailer, partly because I love him and his arc, but also because his character is the only one that carries forward into "The Silver Chair". So if the series is going to continue in any logical way, he has to be an important character that the audience will come to care about.

I can be on board with making Ramandau's daughter a stronger and more important character, for sure (with a name, even), as long as it works within the universe and the story. Arwen is a good example of that, and I also think some of the tweaks to Susan in the first two movies. Much as I love some good classic fantasy, the treatment of women was not always the best, and anything that updates that is to the good.