There's not much new here, but there is a lot of Blizzard confirming what players have already discovered about the voice chat system. People will be one-click mute-able, and voice chat will be able to be disabled by Parental Controls. Blizzard also makes a few interesting points about bandwidth-- while they say voice chat won't have a big effect on those with high bandwidth connections, they say people who currently experience high latency will likely have bigger problems.
And perhaps most disappointingly, they almost sound apologetic about the quality of the sound. They recommend multi-thread processors (as if that's something someone can really upgrade to without getting a whole new computer), and they acknowledge that third party applications will likely have much better quality.
Not that their voice chat system is bad-- as I've said before (and as we found out in the voice chat survey), lots of players will definitely use it. But third party applications aren't going away anytime soon either.