For the most part, Warlocks will play the same as they have been all expansion. The main new issue is how MG and FF works together now. Fel Flame is losing it’s DoT enrichment so the question is if it’s worth it or not.
From what Blizzard wants us to do is to use Fel Flame on the run, similar to Scorch for Mages. While the change isn’t really needed as Fel Flame wasn’t used often enough by most Destro Locks.
Also the biggest change is that Warlocks can not longer cast on the move from a passive standpoint. It’s now an active ability, and while useful, it will now be used with a two step macro along with Burning Rush. I don’t see the point to keep them separate as you want to cast and move at the same time and why not do it at a faster speed too.
Right now as I see it, I’m not sure if FF is worth putting in any macro right now. It’s way too situational, and we have no idea how the fights are going to be in SoO. In ToT, I can see using that on almost every fight.