Warlocks again :/ !!

If I'm posting here it's because I do appreciate some of the concerns and opinions raised in this thread, but also to give you an update, as this thread and the video were created before the latest beta build where quite a few warlock abilties got changed, like the cooldown of the instant fear among a few other things.

Talks about numbers.
Ignores the Instant Spammable 8 second fears elephant in the room.

I understand and share your concerns with giving warlocks another instant fear, but on the other hand MoP adds and changes a lot of abilities to all the other classes, and we can't think of any new spell independently from everything else. I wouldn’t dare to claim that this is unbalanced until I actually experience it in a good testing environment, and that means playing vs all classes with players that are already experienced with all of the new MoP abilities.
You can be sure devs are paying very close attention to both the PvE and PvP side of MoP, we’re still a long time away from the final version, and there’s still enough time to change anything related to tuning.

Also, making fear instant or castable matters little for PvE, while for PvP it makes a huge difference. So you can be sure that on a spell that is clearly directed at PvP, developers will make sure it feels balanced, and they do take a lot of the feedback from the community when deciding this type of changes, so if you guys actually provide good, sensible reasons, if possible backed up by data, as to why do you think an instant fear with 10 sec cd in the environment of MoP, considering all the new variables that MoP's content brings in, every new kind of synergy that will exist between classes, etc… and after that you still think the ability is overpowered, then I’m sure you’ll get their attention and if it turns out they agree with you, I’m sure a new patch will come fixing the issue.

We're all free to speculate about how every new change in the beta affects PvP Balance, but I'd wait a bit more before jumping into conclusions about how some class will be OP in the final version, there's still a long way to go, and if you want to help us out, we really do appreciate it if you could stop by the beta feedback forum and gives us your constructive input.

As some of you may have noticed, there's already some notes about the latest beta build out there.
You have also a few posts (#1, #2, #3, #4) with information from development regarding warlocks and the latest changes.

Here's a short summary if you don't want to read all those threads:

• The Everlasting Affliction glyph was providing a huge DPS increase, but we don’t want huge DPS increases to come from glyphs.
  Instead of simply nerfing the glyph, we baked the benefits that the glyph provided into the entire class via Pandemic, a level 90 passive ability, and changed the glyph to something completely different.
• Drain Soul still deals double damage under 20%. It being missing from the new tooltip is just a tooltip error and has been corrected for the next build.
• The 25% nerf to most Affliction-specific abilities should amount to a ~20% nerf. This is indeed a rather extreme amount, because they really were that extremely overpowered.
• The Malefic Grasp mechanic change should not be a nerf at all.
• The community simulation results of this new build are showing Affliction and Destruction very close with Demonology significantly ahead. We’re also seeing that internally, though not quite as extreme. We’re investigating to see what discrepancy there is there, and how much of an adjustment is in order.
• Nightfall is a 0.5% stacking proc chance now (~5.7% proc chance over time).
  That’s not intended to be a nerf to the frequency that Nightfall procs because you’re getting roughly twice as many chances per second to proc Nightfall as before.

These changes come after devs realized some numbers were simply off. The game is still in beta, it is expected and completely normal for this to happen and it's usually in the latest stages of development that this kind of fine-tuning gets more attention.
While we take players feedback very seriously, it's important to understand that these changes are not a direct consequence of any complaints about warlocks being overpowered. Changes are done to the game only after getting everything thoroughly checked out and verified internally. External data helps us a lot with directing our attention to subjects that possibly otherwise we could miss or be slower at fixing, but never work as a basis for a direct change.

The discussion on this kind of threads can easily get derailed, so as always, please keep your posts on-topic and continue providing us with constructive criticism and opinions about MoP here, if possible, backed up by real data and in the case of bug reports, please clearly describe a way for us to replicate any issue you may encounter over on the bug report forum and be sure to read the guidelines before posting.