Upgrading three sites took about 15 minutes - looks good. One thing I noticed was that the navbar template changed, but I didn't want to reapply my changes, so did a comparison; seems the only change from the RC was they removed one of the menu items:
Code:
<!--<if condition="$show['avatarlink']"><tr><td class="vbmenu_option"><a href="profile.php?$session[sessionurl]do=editavatar">$vbphrase[edit_avatar]</a></td></tr></if>-->
Thought that might help some people when they go to edit their templates.