By now this would be my casting:
Bruce Wayne/Batman - Ethan Hawke
Alfred - John Cleese
Joker - Joseph Gordon Lewitt (if you've seen Hesher
you'd perfectly understand this decision)
Harley Quinn - Lindsey Stirling (not actress but perfect for the role: http://4.bp.blogspot.com/-iPoWKOhZk4...8d10976_cr.jpg
Poison Ivy - Marie-Josee Croze (http://www.cineol.net/galeria/fotos/...roze_59718.jpg
, in a kind of style like the Ma-Ma of Dredd
Victor Zsasz - Christian Bale
Rha's Al Ghul - Jeremy Irons
Talia - Jena Malone
James Gordon - Bryan Cranston looks great!
Barbara Gordon - Mia Wasikowska
Selina Kyle/Catwoman - Asia Argento
I still have to think about the rest of characters...