Well personally I'd rather see a cast more true to the original, but they are reaching an international audience, so I would expect to see a non 100% Japanese cast - which I'm fine with. Really. It wouldn't be that bad.

Especially Asuka. I hope they use a qt, red-haired German girl for her.

Oh, and if anyone didn't know, there are loose plans to somehow fit the voice actors into cameo roles in the movie. That should be fun XD.