I think this is the right section to post this in (and no one else has posted it), but Derek Steven Prince is Vexen's voice actor. He confirmed it on his mailing group as well as his myspace fanclub:
:>;;;; I've heard from a fairly reliable source that the rumors are true and that the casting's been done and work is complete for that. One of the voice actors (who I heard was doing Vexen) I looked into said on his mailing group that he's doing a secret project for Disney which he isn't authorized to talk about at the time.
If it turns out to be true, then Vexen's got a surprisingly not-as-crazy-as-I-would-have-thought voice.
.-.; I don't feel comfortable releasing the voice actor's name since he stated that he's unauthorized to tell and it's rumor.
The supposed Larxene sounds cute and is in some US commercials. :3
D8;;; I'm not a member that posts often so... *shrinks back into the abyss*