You may never know with Mandriva, but I feel there is a good chance to have a Mandriva 2008.1 "One" XFCE flavor. There is a Beta that doesn't look that bad!

The Development/Ideas/Xfce Mandriva wiki page, created on May 23, 2007, is supposed to "List ideas for a better integration of Xfce in Mandriva Linux." The main suggestions seem to be:

Include Xfce at the same level as GNOME or KDE for installation — (in progress)
Make Mandriva applets as mdkonline, netapplet, etc. work in Xfce systray — (DONE)
Have a Mandriva Menu for Xfce — (DONE)
Make themes for Xfce : ia_ora, etc. — (DONE)
Make a Mandriva One with Xfce (not officially supported) — (in progress)

Wow. A Mandriva One with XFCE? Apparently, this is going to happen soon, as there is a non-public BETA mandriva-linux-2008-one-xfce4-int-cdrom-i586.iso, which looks remarkably well for a Beta!

OK, it looks just like in the official screenshots from that wiki page, here's what I got:

More here