Pertaining to Oz, Mila Kunis was just on Conan to promote the film, and brought a clip with her. It was a very quiet clip - just a dialog between her and James Franco - and a small selection of Elfman's score. It wasn't enough to make a final judgement, but what I heard sounded very reminiscent of Alice in Wonderland. The clip is sure to be online by tomorrow, in which case, I'll make a post with the link.
EDIT: OK, here we go. Like I said, it's not much, but it's at least a tiny taste. The clip starts at the 31:20 mark: http://teamcoco.com/video/category/full-episodes/page-1