Don't hijack his thread.We don't need more classes, we need specilizations for those we already have.
Mage => Archmage/Sorcerer
Warrior => Knight/Berserker
Paladin => Inquisitor/Dragonslayer
Druid => Shapeshifter/Elder Druid
Priest => Cleric/Warpriest
Warlock => Fel Summoner/Eldritch Warlock
Hunter => Sniper/Ranger
Shaman => Earth Caller/Dreamwalker
Monk => Crane/Tiger
Deathknight => Doomguard/Lich
Rogue => Assassin/Infiltrator
Each specilization provide new abilities, but prevents the use of others. Specilizations are chosen by doing an associated questline. Once chosen, a specilization cannot be changed.