Ubuntu Lucid Lynx 10.04 should be released today. What I saw in the beta was pretty good. One of the major changes: The window control buttons were moved to the left side of the window borders (pretty Mac-like). There also was announced that a menu on top of the screen (again we know that from MacOS) is a possible feature for 10.10 so we can expect some pretty interesting user-interface changes.
Nothing on the ftps yet, so stay tuned with ubuntu.com.