i agree wholeheartedly on each and every point you make. i think seeing the development of all of the relationships is important. i want to see the storyteller unfold into the rider he was, too, which it looks like they have included. i know they cast jeod, so i assume that scene is there. and angela is cast, but not sure about solembum, so hope they don't miss out on that part of the story.
saphira looks great. whoever does her voice needs to have a rich, powerful, yet sweet voice. someone one mentioned cate blanchett. she might be good. she must be young, but have wisdom in her voice. it'll be interesting. i have found no spoilers yet to indicate who they have for her voice.
i always felt the relationship scenes in the books were much more developed than the battle scenes, but i think that is because he is a boy (the writer) and has no experience in a battle to truly represent what it is like, other than reading about them time after time. tolkien does an amazing job with battle scenes, because he has been in the heart of horrible battles and true evil.