Originally Posted by
Aettis
1) Scythe based DH is already in game, can't remember the NPCs name. Druids, meh. They've had an additional spec for expansions now. I'm sure they'll get other changes and additions to ease them in. New forms for boomkins, etc. Melee DPS priests, Anduin is the precedent, being a priest and wielding his fathers sword. Shamans, Resto has lost their "Spirit" in all casting animations, and become just water. Earth, fire, and lightning heavily represented in Ele/Enh, with Spirit kinda left out. Also could bring back totem play. And two healing specs isn't unheard of. Necromancer locks exist in game(See Scholo/Naxx/etc)
2) You have to remember, their team has tripled since WoD. That allows for a lot, as we've seen with Legions content pacing.
The rest, *shrug*. To each his/her own. Last year, we never would have expected the constant content that Blizzard has done with Legion. Yet here we are. Just because they haven't done it in the past, does not mean it's not possible. And to be fair, I want most leaks to be true. :P I like new and shiny things(who doesn't), and most leaks encompass things I've been waiting for(Infinite, Azshara, old gods, etc).
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To add to the bottom part, it's possible only some of these are coming, and not all.
Edit: In Legion, they created 33 or whatever number, of artifacts with unique abilities, traits/passives, and interactions, with quest lines and such. Which is also a core part of making new specs. In a sense, they already have precedence for putting in a crap ton of work for numerous specs. Lets not forget the huge revamps to classes and specs. It's not impossible to add 11 new specs.