Now that there is xfce4 in fl:2-devel, I'll go to add some patches to thunar that didn't make it into 0.9. We need a mailclient too, so i will cook claws-mail, because it's a nice gtk+ client (for me, evolution or thunderbird, just don't feel right as default for Xfce Edition).
Later i have to start hacking on group-desktop-platform, to check what we need. I think it will turn out as a slightly modified Gnome Edition just with Xfce instead of Gnome and will step by step change things where needed/wanted. After all it's Xfce not Gnome.