Yo, a pre-alpha of xfce 4.8 has just been released : http://foo-projects.org/pipermail/xfce/2010-November/027848.html
anyone interested in testing it can get it w/ cd /usr/ports/mystuff/x11/ && git clone http://rhaalovely.net/git/xfce4 and build/install/update all the components in the subdir. not all the bits and pieces are here yet but most core components works fine. Transition work will be needed for ports depending on exo-0.3 and all panel plugins will have to be rebuilt. Landry