Title says it all. Putting aside all the Tinker talk, one of the most likely classes in my view is Wardens in 12.0 (Midnight). They fit the theme (Elves and Shadow), there’s lore that Maiev is expanding the ranks of Wardens after Dragonflight, and Blizzard put out a 2 Warden-based armor sets that were called “Sun Warden” and “Moon Warden”, which indicates to me that they’re giving Blood Elves the ability to be Wardens.
Wardens are extremely popular (if the armor promotion from the trading post was any indication), have distinct armor, weapons, and an entire set of open abilities. They could easily slot into either Mail or Plate armor, and offer a new tank or support spec for players.
I don’t think Midnight, which is set in Quel’thalas, is going to have that much of a night elf focus. Doubt we’d get a 3rd night elf class in an expansion not focused on them. If we get an elf class it’ll be based on blood elves or void elves.
Well Metzen did say that Midnight would be focused on uniting the Elven tribes. Maiev spreading Wardens throughout the other Elven groups would be a form of that unification.
Also the Warden trade post armor set kind of hinted at Blood Elves getting Wardens as well.
Aside from a couple of statues in the secrets of Azeroth underneath Karazhan, The only two times we ever dealt with the wardens were at the end of burning crusade and during Legion. Outside of that, they haven’t even made an appearance at the anniversary event. at least not that I’ve seen. I can’t imagine they would pull out this very random class just for midnight.
The next class should be available to all races. DH are limited to 2 races Dracthyr have a unique class and Earthen are a unique-ish race that can be multiple classes.