Your party frames are tidier. A party member's row only appears while they're in a fight or hurt, so a calm, healthy group takes up no room at all. Your own health is in the list too, so you can see the whole group together.
Cleaner health bars. The grey box behind the party frames is gone, and health bars on party members and other players no longer have a grey background behind them.
Chat stays up. Chat is now set to Always by default instead of fading out. You can set it back to Fade in Edit HUD.