Warlocks now get a different type of bar for each spec.

https://github.com/Ketho/wow-ui-source/blob/beta/FrameXML/ShardBar.lua

Tukz has a plugin for it on wowinterface, but he rewrote some of it on his private git (didn't update on wowinterface yet).

http://www.wowinterface.com/downloads/info21226-oUFWarlockSpecsBars.html

Here is how I tackled this myself:

• Burning Embers - c5bbf4a
• Demonic Fury - a494ea6

It is two elements, which is probably not ideal for oUF itself, but it works well.