So at the moment the Allied Races cannot be hero classes like DH and DK but Ion said in the interview that they are looking to make some available where they can make sense.
Which ones do you think or would like to see and why.
Nightborne, LF Draenei and possibly shouldn’t have any. None were around when the story of these classes start. This leaves :
Void elves, Highmountain and Dark Irons.
For DH, only Void elves could possibly make it as you could be Illudari and have tried the void and gotten expelled.
For DK - void elf, HM Tauren and Dark Irons could be DKs, all of the individuals could have made it to Arthas. But if HM Tauren could have made it, so could Zandalari.