Since pre-patch demonology was reworked so that hand of gul'dan wasn't on a 12 second recharge timer and is now avaliable for use whenever you have a soulshard, 1 soul shard spawns 1 imp from hand and 4 respectively spawns 4.
With the HFC 4 set and archimonde trinket you're able to spawn a SHIT load of demons, the 4 set is meant to spawn a random demon on an 8% chance whenever your wild imps cast fire bolt and the class trinket has a 37%(normal) to 66%(mythic wf) chance to spawn 3 wild imps. With the new demonic empowerment you can empower ALL your demons including the ones from 4 set and class trinket.
This is where your pre-patch rotation and slightly broken damage comes in.
With high enough haste (new best stat for demo) you can cast demonic empowerment -> demonbolt -> hand of gul'dan over and over to spawn a horde of demons. This may be intended on blizzards part but i have seen loads of warlocks not doing this when (by warcraftlogs) this is the best way to do your rotation currently.
The rotation doesnt change on most fights and you just cast these abilities on the main boss and never stop pressing these 3 buttons in order. With enough gear you are guerenteed to top damage every time.
The talents you should run while doing this build are as following:
Note: you may swap out your 75 talent and 45 talent. 100 talent can be soul conduit if you want even more demons (damage is around the same) and the level 30 talent can be implosion after spawning enough imps you can explode them into an aoe packed target such as on xhul, mannoroth, hellfire assault, iskar and kormrok.
Apart from your new 3 button rotation its recommended you use Summon Doomguard and Grimoire: Felguard as well as having your active pet be a felguard on cooldown.
Damage on archimonde (mythic and heroic) i've tested to be around 155k dps with full mythic best in slot gear (with wf worldboss trinket) and mythic wf class trinket.
Just to re-iterate you should only be using demonic empowerment then using your instant cast demonbolt then hand of gul'dan at 1 soulshard and just repeat that all fight.
On pull its recommended to use your 1 soul shard you have by default on your Summon Doomguard ability. If your doom procs damage and you get a spare soulshard make sure to use it on Grimoire: Felguard for maximising dps. Never try to kill adds as your demon AI is completely ****ed and you will lose damage while they cancel their casts and run to the new target.
This probably won't get nerfed as the new set bonus system wont allow you to use this at level 101 and the class is generally mean't to be played differently at level 110 raiding.
I woulnd't try this without 4 set and at least a heroic class trinket as you can just follow the normal rotation and do more dps. Enjoy Warlock friends!
Heres a skada log of a quick heroic archi pug i did to show with another demo warlock doing the rotation slightly different to me (I'm the top):
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