Blizzard
As we mentioned when race information for Lightforged Draenei and Void Elves was datamined during development of Patch 7.3, we’ve found that setting up certain races as though they were player characters can be highly advantageous for NPC customization in story content. While those races did become Allied Races later, we still intend to use this approach for non-playable races.
Please don’t take a race being datamined in this way as an indication that it will become playable in the future! :)