Taylor Swift has been passed over. The role of Eponine has gone to Samantha Barks from the 25th Anniversary Concert instead. I'm not a huge fan of Samantha, but I will HAPPILY take her over Taylor. She's got experience and true pipes. Hopefully someone will talk to her about smoothing out her accent.
Read about it here: [link]
Also, Grantaire's casting has been made: George Blagden. Fresh out of drama school, it'll be interesting to see how he does.