On Tue, 24 Nov 2015 14:42:37 -0500
Frank McCormick <beacon@videotron.ca> wrote:

I am still running Fedora 21 with various desktops including XFCE.

Because of various bugs in the version I am running
I wanted to update to 4.12 -- 4.10 is the current
Fedora 21 version.

A user on the XFCE forum pointed me to a user
repository on Fedora which has 4.12...and this morning
I updated without a problem.

Is 4.12 ever going to be in the official 21 repositories ?

As others have said: nope. ;) 

In general we don't tend to upgrade major Xfce versions within the life
of a release, they just keep the one they started with.

As a side note you may want to upgrade very soon, Fedora 21 goes end of
life on december 1st (monday). 

kevin