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The Xfce 4.12 PPA was updated with the final stable Xfce 4.12, for Xubuntu 14.04 and 14.10.

For what's new in Xfce 4.12, see THIS article.

Xfce 4.12 Xubuntu 14.04
Xfce 4.12 in Xubuntu 14.04

Xfce 4.12 Xubuntu 14.10
Xfce 4.12 in Xubuntu 14.10 (with extras: TopMenu and DockBarX)

Until yesterday, the Xfce 4.12 PPA didn't provide the final Xfce 4.12, but development builds (4.11.x) for the Xfce Panel, Settings xfwm4 and so on. Also, until a few minutes ago, there was a small issue which didn't allow updating xfce4-power-manager. That's why I thought I'd wait until everything is ready and the PPA actually provides Xfce 4.12 before posting instructions on how to install it in Xubuntu 14.10 and 14.04.

Upgrade to Xfce 4.12 in Xubuntu 14.04 or 14.10

Since Xfce 4.12 was just packaged for Xubuntu, you may encounter issues by using this PPA! Use it at your own risk!

Issues encountered so far (there might be others!):

1: Qt4 applications don't use the GTK style after upgrading to Xfce 4.12. This can be fixed - firstly, install qt4-qtconfig:
sudo apt-get install qt4-qtconfig

Then, launch "Qt 4 Settings" from the menu (or via a terminal: "qtconfig") and on the "Appearance" tab, set the "GUI Style" to "GTK+", then select File > Save.

2. There's also an issue with Qt apps not using the correct icon theme. It looks like the old method of fixing this no longer works so for now I don't know any workarounds for this.

It looks like the two issues above were also present in the Xubuntu 14.10 releaseso this is not a new issue.

To upgrade to Xfce 4.12 in Xubuntu 14.04 or 14.10, you can use the official Xubuntu Xfce 4.12 PPA. Unfortunately there are no stable Xfce 4.12 packages for Xubuntu 12.04, at least at the time I'm writing this article (there are just a few Xfce 4.11 packages).

To add the PPA and upgrade to Xfce 4.12 in Xubuntu 14.04 or 14.10, use the following commands:
sudo add-apt-repository ppa:xubuntu-dev/xfce-4.12
sudo apt-get update
sudo apt-get dist-upgrade

Then, log out, log back in and you should be running the latest Xfce 4.12 (stable).

Tip: to install a few extra packages like XfDashboard, xfce4-pulseaudio-plugin, thunar-dropbox-plugin, Skippy XD and more, you can use the Xubuntu Extras PPA.

How to revert the changes

If for whatever reason you want to revert the changes and downgrade to the Xfce version available in the official Xubuntu repositories, you can use PPA Purge to purge the Xfce 4.12 PPA (using PPA purge, the PPA is disabled and all the packages from that PPA are downgraded to the version available in the repositories).

To install PPA Purge and purge the Xubuntu Xfce 4.12 PPA, use the following commands:
sudo apt-get install ppa-purge
sudo ppa-purge ppa:xubuntu-dev/xfce-4.12

You may also be interested in: How To Set Up Compiz In Xubuntu 14.10, 14.04 Or 12.04