As I sit writing this, there's a huge storm raging outside my house. Thunderstorm's customary 45-second cooldown isn't in effect, and there's so much lightning flashing it's sort of like Pikachus are having a Pokemon battle in the sky. Oh, and there's rain, too. Not the nice, healing kind that you like to stand in, either. I'm thinking this storm might be the response of elemental shaman everywhere to today's latest 4.3 changes, when this gem was found on the PTR. (Please note: This isn't reflected in Blizzard's official patch notes yet, but the change is up on test realms.)
Yeah, that happened. We kind of had a feeling it would, since the T12 set bonus is so ridiculously good -- like, it's so good that if it were a cake or any other form of dessert, it would give you diabetes just from looking at it. My earliest estimates of the set bonus said it was something like a 3,000 DPS increase. By BIS heroic gear, it's more like a 6,000 DPS increase from a single set bonus. For gear balance issues, that bonus was too good. Blizzard generally intends set bonuses to be within the ballpark of 5% DPS increases. This was more like 15% to 20%.