When patch 3.1 went live, Destruction warlocks (and 0/40/31s) had a lovely time smacking everything in sight with massive Conflagrates. This was promptly nerfed, for PvP purposes; the devs felt it was overpowered for 'locks to be able to do that much, that fast. However, it was acknowledged that Destro would need some PvE buffing to make up for it.