oh right, wizcon.
Because they don't know how to nerf Mages even though high profile mages have already said what changes are needed, and because Warlocks are their favorite boytoy.
I play a Warlock this entire expansion, and PVE wise, aside from those 2-3 fights where the spec shined, it didn't have much place in PvE, you had to pretty much run Destro/Demo on most of the content. And then they overbuff it overnight and it becomes the best single target spec in the game, like what the fuck. And yeah, it's not like Warlocks struggled in PvP in S16 either. They were not their usual level overpowered, but they were not bad by any means.
So yeah, classic Blizzard. Though, if they nerfed them, cleaves would probably be the only thing that'd queue, and honestly I'll rather sit in 20 sec CC chains than fight mongoloids that target me from the moment gates open to the moment when the match ends.