They are just elves. Dead elves that we already have playable with Death Knights.
Which should be given to the current playable worgen and not an entirely different “race” of worgens like they did with Lightforged Draenei and regular Draenei.
See this is the main crux of these “suggestions”. They do not fit in with what the Horde and Alliance are suppose to be because neither of those factions are evil (at least they are not suppose to be). But people keep on bringing these ideas that runs counter to the identify of those factions, as if these races are “free agents” just waiting to be signed by a new team.
Evil races should not ever be part of the Horde or Alliance. Ever.