I have been waiting for Hathaway to get another meaty dramatic role after her stunning turn in Rachel Getting Married. And I have been waiting for her to do a musical. That casting would make me doubly happy! I did also like the Cotillard suggestion, though.
As much as I am tepid on Lea Michele, I would take her in the cast a thousand times over someone like Miranda Cosgrove. Why not just cast Miley Cyrus as Eponine?
And I think Helena Bonham Carter would be inspired as Mme. Thenardier. It's not much of a singing role, but I think she'd be up to what singing there is. I liked her in Sweeney, but think she was playing that role, and I'm sure her performance would be entirely different in this. Anyone who thinks she can't do bold and loud should watch her performance as Belatrix Lestrange in the Harry Potter films. I'd just be happy if they cast anyone in a Thenardier that isn't a comic; I'd like to see the darker undertones played on film.
"Art, in itself, is an attempt to bring order out of chaos."-Stephen Sondheim