I'm not sure if Anne's "new" voice is better or not... even if it's not better, I still like it. I liked the "new" trailer, especially that we saw Samantha in the "heart full of love" (I've thought for ages how would they do that scene; now I finnally know...)
This youtube comment might make some sense:
But Anne said Tom went with her "second take" ... and it still feels like post-production to me. Dunno. They might even choose neither of the two versions for the final cut. But the first teaser was certainly more raw and real...
I think the new scenes in the trailer include Javert's suicide (where his face is covered with sweat...) and Javert just after the first song, "look down", observing how Valjean leaves the prison (well, that is a rough guess). I even imagine how he sings, "Do not forget me, 24601" up there on a hill....