First of all, a disclaimer for those who need it: Using datamining to figure out what’s going to be in the game in the future can be a mug’s game anyhow, and doubly so in World of Warcraft. Datamining can point the way to future content, but it can also point to Azshara Crater. Still, the prospect of four new sub-races in the game’s files may well mean that players can try these races out… or it may mean that Wowhead’s datamining just found a new way the game is organizing data.
Still, the possibility of having four new subraces is enticing, isn’t it? The four options found are Nightborne and Highmountain Tauren for the Horde, and Void Elves and Lightforged Draenei for the Alliance. They all make a certain amount of sense, but their inclusion is far from certain; these might be racial files stored differently or even just an abortive effort. We’ll know more once BlizzCon rolls around and we find out about that next expansion.