I really hope DK ghouls get the Warlock demon treatment.
I want this, specifically:
Undead trolls have been in the game since Wrath, and we still don’t have an option to have them as ghouls.
Customization as a whole for most pet classes needs to catch up to Hunter and Warlock.
Hell, even Warlocks could use more demon options- tons exist in-game.
Dk needs some love in nearly every aspect while they’re at it
Agreed. I’ve tried making my own posts supporting a barbershop version for dk pets.
I’m hopeful someday they allow this considering blood now has a blood east in the hero tree so this wouldn’t just only be customization for unholy.
I do hope we get some “meaty” unholy sound effects some day. Part of the reason most dk specs fall flat for me these days is that their melee abilities all consist more so of spell sounds rather than the kinetic slashes/clanks/crashes that other melee specs have.
You can almost feel it with other melee spec sound effects and it’s satisfying; whereas frost unholy and blood fall flat in this regard. It makes them feel much less satisfying.
More for the priests’ shadow pet thing as well. Lots of cool voidy critter models out there.
I …agree with all of these choices.
They just got some!
I love my demon customizations. 
Just imagine how hard a zandalari DK would go while having all their undead be the various undead troll models we got in BFA