Unity's currently not very stable right now in Natty. The latest daily builds have Compiz crashing at the drop of a hat.
Despite that, we're seeing new features being built for Unity. The new stuff includes progress meters, number counts and a few others. There's even a filtering feature that animates the launcher icons based on the filetype you drag and drop onto the launcher.
All these are the little things that help make the Unity experience a little more pleasant. At least that's the intention.
Unity - A taste of things to come
Ubuntu's Unity on the desktop
Unity as the default desktop