XFC need more attention, beside normal debugging, and the following things are planed for XFC at the moment.
When we start using Gtk+3 in version Xfce 4.8.12, the plans for XFC (4.8) will change to :
I hope that the support for introspection, may free up time for the more central elements.
Also note that XFC 4.6 and XFC 4.8 (Gtk+3) will not be compatible.