Warlock will keep the bug of Shadowburn granting 2 embers on a kill
Ghostcrawler posted today earlier:
"We are going to go ahead and grandfather in the bug of Shadowburn granting 2 embers on a kill. It is technically a bug, which is why we fixed it, but it's been that way since MoP launched and we don't think it's causing huge balance problems, so in cases like this, we think the right thing to do is just make it official."