User blog comment:Jkphantom9/Gray teasing (again), this time, on the announcement of the Japanese dub cast/@comment-10380701-20150321012424

I would definitely lose my mind if some veterans like NORIO WAKAMOTO and Masako Nozawa somehow showed up in RWBY.

That's just those two though. I don't know enough about the more modern seiyuus to really freak out about anyone else.