As a longtime user of Fedora's Xfce spin, naturally I'm interested.
The reasons why Xfce 4.11 is not in Fedora Rawhide (because there is no 4.12 release imminent, and 4.11 in "stable" Fedora would be bad, but there is a COPR repo for those who want it)
Rumors that Xfce, the project, is dead (It's not -- fixes and small changes continue to be committed; there's just no timetable for a 4.12 release)
The Xfce spin leaving its 700MB CD size behind and now aiming at 1 GB USB flash drive size in Fedora 22
Xfce continuing to be available for RHEL/CentOS users in EPEL
Ways of making Xfce work better on HIDPI displays (but don't expect miracles until Xfce adopts gtk3)
Read the original post. It's well worth it.
I've been running the Fedora Xfce Spin since F18, and I think it's one of the best-kept secrets in the Xfce-running distro world. It comes well-configured out of the box, looks great, is as cutting-edge as you'd want and really does just work most of the time.