I get the impression Rukia will still be Asian if this goes to casting. Americans have such a hard on for Asian girls (and who could blame them
)
I'm more interested to see exactly what elements of the manga/anime they decide to make into a movie. If they were smart they'd do the SS arc. It's the only arc to date that has had consistently positive fan ratings. Besides, that arc actually had a decent story line.
But in the end it's a moot point. There is no way that this movie will get the same budget of films like 300 or Harry Potter and the Half Blood Prince (or anywhere close to it) so it will end up looking like a cheesy flop (a la DBZ).