I may be the only one, but I hate what they've done to affliction this expansion. Feel free to completely disagree with me, but I'm curious if anyone else feels similarly. The new soul swap is a fun mechanic but it just seems very difficult to me to keep dots up on a target anymore unless you spend shards soulburning soul swap, atleast with a melee hitting you. I didn't play it extensively so maybe it's just me being rusty from not playing affliction in so long, but it seems like by the time you soul swap to a 3rd target the dots are already about to fall off the first target, with UA only being ~14 seconds without haste.
Damage in general is low across the board so I can't comment about that much.
Destro feels much the way it did before the patch, albeit with much reduced damage (like most classes, though chaos bolt still hits about the same, 70k with some trinkets up/a cd up). I was spamming 22k non-crit incinerates into a priest when I was testing damage. Moving at full speed with incinerate is fun but there's no way to keep immolate up at all besides stopping to cast it, which may mean it's not even worth using anymore, i don't know. That damage was with grimoire of sacrifice, and I'm not sure if that's a better choice or if it's worth switching to soul link now that it's stronger.
I do know that I couldn't kill a shockwave/storm bolt warrior to save my life once he got down to below 35% health. Bbetween shockwave/stormbolt/chargestun/disrupting shout, and spell reflects there was no killing him with all their passive regen.
I'm curious how the damage buff to FelFlame with movement will compare to Incinerate with with KJC. Possible they could be close in damage.
You run oom pretty quickly spamming fel flame, or atleast I do as destro. You end up with 3 seconds or so of waiting for enough mana to cast then next fel flame. I have no idea what the mana cost will be for destro after the patch though, could be different.