While it’s not exactly newnews, nor is it as big of an update as having the final release of Xfce 4.6 available, the Xubuntu team has packaged Xfce 4.4.3 for the Ubuntu repositories, and the packages are available for Xubuntu 8.10 users who have backports enabled in their software source.
To enable backports, go to your menu and select Applications > System > Software Sources. You will be prompted to enter your password, and once the application is fully launched, click on the Updates tab, and place a check in the "Unsupported Updates (intrepid-backports)" box. Once you’ve marked that box, click on the close icon. You will be prompted to refresh your software sources, and new updates should then appear. The upgrade to Xfce 4.4.3 should be included in that set of updates.
Of course, you could update your sources via the command line, too. I need to run to the airport now, so I’ll leave well enough alone and assume that, if you’re interested in updating your sources list using the command line, you would know how to do so. :)
Interested parties can view the Xfce 4.4.3 changelog here.