Give each spec sort of an improved CC, sort of like in Cataclysm.
Destruction gets Shadowfury (on a 20 second cooldown), Affliction gets instant Howl, and Demonology can get an improved Death Coil (like Mortal Coil).
The current CC tier would then have talents such as: Shadowflame (70% slow), a ranged Howl with reticule at the cost of 0.5-1 second cast time increase, and maybe a passive that renders the target immune to silence and interrupt effects for 15 seconds after being struck by an interrupt effect that doesn't lock out your schools. This would be amazing and once again promote smart play, on both your and your enemy's part. It would also reduce the amount of blank casts used that Blizzard has pointed out to be a bit degrading in PVP.
As for Blood Fear, it is a very annoying talent for both the warlock and opponent. It reduces the skill cap and limits CC. Since there's been an increasing amount of immunities against Fear, which many warlocks complain about, I propose the following change: The first 4 seconds of your fear ignore any immunities, a part from diminishing returns. (Maybe even Dispels? ) I think it would be an attractive change. I would personally take it.