NPR's All Things Considered has a short interview with the CTO of CereProc: http://www.npr.org/templates/story/story.php?storyId=1240872... The voices aren't perfect but they're definitely better than anything else I've heard. Ebert's voice isn't demoed in the interview. I'm guessing Oprah wants to be the first to show it.
This combined with improved subvocal stuff like http://www.youtube.com/watch?v=xyN4ViZ21N0 would make silent, covert voice communication possible. No more annoying one-sided conversations from cell phones.