This is copied from another warlock thread.. I updated it for the new patch.

I am running a Dk/priest/3xWarlock team with my warlocks still running a a FG/Ember spec. FG/Ember is now listed as one of the best dps specs in the game for warlock and has actually improved in dps with the patch.

FG/Ember

This gives you the felguards which are relentless killing machines. As
I stated before... when you are repositioning.. they are killing.. When
you are lifetapping.. they are killing. When you are turned around from
fear and need to be gathered up... they intercept and keep on killing.
When you are in town.. they are dreaming about killing. The zero hassle
pets do around 500 to 600dps each in my group. They can tank trash in a
pinch if somehow you are failing to hold aggro for whatever reason.
With the right buffs it scales up nicely. Felguards
also cleave and when you have three of them it starts to add up for the
trash packs.

Button 1:
/cast [target=focustarget, nochanneling] Curse of Agony (or elements on
one of them since you don't have a DK giving ebon plague)

Button 2:

/castsequence [target=focustarget, nochanneling] reset =10/target
Corruption, Immolate (when they go up in this order you can pretty much
cast them together as a pair when they drop.. they sync up nice)

Button 3:

/cast [target=focustarget, nochanneling] Incinerate

button 4:

/cast [target=focustarget, nochanneling] Soul Fire (for use in the decimate phase which can be tricky to pull off when multiboxing and the phase sometimes just doesn't last long enough for you to bother.. but hey it's there if needed)

For trash I just use the corruption, immolate and then spam incinerate
till they are dead. For Bosses CoA gets thrown on as well. Soul Fire can be weaved in during the decimate phase but I'm having a hard time remembering/bothering/ since things die too quick nowadays. The rotation is simple and easy with not too much to keep track of on your dots. Incinerate being on it's own and not being in a cast sequence is a few hundred dps increase over a castsequence with it spammed in.

I am very happy with this set up.

Allesarelle