First we have seen that there are (NPC?) Pandaren and Allied Race skins for Death Knights.
Today we see these two portals, that could be related to a "new" starting zone for these two hero classes, or a new hub for both of them:
Could this all start to hint / confirm both Death Knights and Demon Hunters will receive new races and new starting zones on 9.0?
With Icecrown Citadel and Tomb of Sargeras as the new starting zones.
From the datamining, it seems all Allied Races could become Death Knights.
Which races could also become Demon Hunters?
My bet: Draenei & Void Elves for Alliance, Orcs & Nightborne for Horde.