If you're getting annoyed with the delay on Primal Fury that patch 5.0.x was nice enough to bring us and you already use or don't mind picking up the addon WeakAuras this is something you can try out. This WeakAura is essentially a combo point tracker, but it works a little different than most combo point trackers (including the Blizzard UI).
Here's an example of what happens when you cast a Shred and that Shred crits and procs Primal Fury:
Combo Point is added.
Shred cast is successful.
Shred does damage to your target.
Small amount of time passes. This time can vary from shred to shred and can be particularly irritating when it takes a long time.
Combo Point is added.
Primal Fury is cast.
A normal Combo Point tracker will, logically, update on steps 1 and 5. This WeakAura attempts to do it quicker and smoother by using steps 1 and 3 instead. Instead of waiting for Primal Fury to activate, it checks if your Shred crit and then shows you the combo point ahead of time.
I used the "DF Statusbar 3" skin that comes with DroodFocus (which is updated, woo!) to make the combo points look like they do in the video. If you don't have DroodFocus installed it will default to something else (probably ugly). The display is imported as a group so that it can be imported all at once, but if you want to customize it you should:
To change the skin or color of the display: Move the Control aura out of the group (click on the small left arrow next to "Feral CP Control") and then select the whole group (click on "Feral CP") and go to the Display tab. You may move the Control aura back in the group or leave it outside after you're done.
To move or resize the display: I'd highly recommend moving the display auras out of the group (click the small left arrows next to each aura, 1 through 5) and then create a new dynamic group and put them in that. This should allow you to set the spacing of each combo point easier instead of having to set each one's position individually.
And here's the code to import the aura:
http://pastebin.com/H0rp7t0B Feel free to tweak the looks and such to your liking, of course. Hopefully someone gives this a shot!
Enjoy