Today's updates saw new Unity and Application Menu versions released for both Ubuntu 10.10 Maverick Meerkat and the Lucid testing PPA.
The Lucid PPA and Ubuntu 10.10 are finally synced - having the same Unity / App Menu version, the only difference being that in Lucid this continues to show up as "Unity" in your GDM login screen, while in Maverick it shows up as "Netbook Edition".
The biggest change in this version is Application Menu support for the Unity panel (the Application Menu is now enabled by default in Unity). The applications still get to keep their menu in this new release since the Application Menu is still in its very early development stages.
Another small change came to the sound applet which doesn't have an orange volume slider anymore and there's less roundness:
This is how it used to look:
Instructions for installing Unity for both Ubuntu 10.04 Lucid Lynx and 10.10 Maverick Meerkat can be found @ Ubuntu wiki.