I should point out that Class Names, Spell Names, and Lore are just fluff. at the end of the day it is the actual game mechanics that matter.
The game mechanics show only one class gap.
The game mechanics have room for a class that can tank and heal
Gear that needs more representation and use
Types of weapons:
One Handed Swords, Ranged Weapons (not wands)
Flavor? that's optional
What we will get is a Mail wearing Tank/Healing class with Swords/Crossbows/Guns/bows they should be a hero class, and if possible use up the remaining hero class archetypes in one go. ie finish out the fluff.
Here is the list of hero classes not yet seen:
Demon Hunter - Rogue, Mage, Warlock
Blademaster - warrior with mirror image.
Ranger - petless hunter
Dark ranger - Affliction Warlock, Petless hunter combo
Sage - Rogue, shaman combo
Shadow hunter - Warlock, Mage, Priest combo class. Very troll specific
You can combine them all into one class
Tank Spec - Caster feel with dual wield bladed weapons, no two handed, use evasion mechanic for tanking. Call the spec BladeMaster
Healing Spec - Make it feel all warlockly and shadowy for healing with drain animations, and dots named for curses. Call them Shadow Hunters
Range DPS- Use of Range weapons no pet, give them a few affliction lock like dots. Call them Rangers
4th Melee DPS Spec - Uses combat rogue like abilities, with a few shaman spells ie Chain Lightning. Call them Sages
For the best flavor have them start in Outland trained at the Black Temple and call them Demon Hunters.
Simple done, I kind of think they will do this. Since that is what they did with Deathknights.