As the first major Xfce update in more than one year, Xfce 4.10 Preview 1 is now available. "The Xfce development team is proud to announce the first preview release for Xfce 4.10. Together with this preview release, the Xfce project announces the feature freeze for the final 4.10 release which is set to be pushed out to the world on April 28th, 2012."
Key highlights of Xfce 4.10 include a new application finder, a new vertical mode for the Xfce Panel/Deskbar, a re-worked settings dialog, basic Synaptics and Wacom settings support, a more polished layout for the Thunar file-manager, and much more. There is an Xfce 4.10 pre1 changes file for those interested in a full list of the work that went into this Xfce 4.8 successor.
Other details about Xfce 4.10 are available from this Xfce.org posting. Look for Xfce 4.10 to be officially released by month's end.