I was just hitting up people this morning about this. I knew the Nexus dump had this in there. I just love that the icon is no longer pixeled. It used to look like it did not belong on a Droid.
so far i noticed the icon has changed, sound quality is better, and it has added the enable speaker button to the right of the message lenght indicator, opposite the play button, whch i really like. can be adjusted during the play of the message.