Here are my ideas since long time ago;
Death Knight: Chivalry (Theme: High Mobility, No Hard CC)
On a Pale Horse - Begin the battle always mounted on a steed. You cannot be dismounted, and your movement speed is increased by 40% even while in combat(a maximum of 140% movement speed when in combat).
Hardiness - Fightning atop a steed has it's benefits. Duration of slowing and disarm effects cast on you is reduced by 50%.
Lord of Command - Your horse has a 35% chance of acting on it's own, alongside you, to help you in combat.
Warrior: Warlord
Ready to battle! - 4 bodyguards from your respective faction join you in battle. You can order them to be stationed at certain points of the battlefield, and adjust their battle styles from CC, Damage, to Defensive/Support.
Ballista / Catapult- Employ a Ballista/Catapult which fires at enemies from afar. The projectiles it shoots as well as it's damage and maximum distance can be upgraded via talents. It is capable of doing moderate siege damage. The ballista will last even if you die. Lasts 2 minutes.
The Warlods Flag - Don a War Flag, granting 20% health and 2% health regeneration every 2 seconds to allies within 20 yards of you.
Paladin: Zealotry
Soul of the Crusader - Gives the Paladin the ability to Dual-Wield. In addition, increases movement speed by 20%, and increases attack speed when dual-wielding by 75%.
Seal of the Crusader - Active attacks have a chance to deal xx[moderate] holy damage and increasing the holy damage taken from you by 20% for 30 seconds, stacking up to 5 times.
Empowered Judgements - Increases damage dealt of your judgement ability by 200%.
Hunter: Dark Ranger (Dark Rangers are trained by a rogue faction formerly under the control of Sylvanas)
Soul of the Dread - Dark Rangers linger between the realm of the living and the dead in order to channel more power to fuel their attacks. When the gauge is 0-99% they are concidered undead. When the gauge is at 100% they are concidered Humanoids.
Dark Arrow - Shoots an arrow which lingers on the enemy and deals Shadow Damage for 8 seconds. If the enemy dies, it will be resurrected as a minion under your command.
Banshee Form: 3-minute cooldown - Become an entity devoid of a humanoid form, reducing damage taken from physical attacks by 80%, 20% for spells, and adding 20% extra damage as Shadow to your ranged attacks for 20 seconds.
Rogue: Swashbuckler
Priest: Holy DPS spec
Shaman: Earth-themed tank spec
Mage: Battle-Mage
Monk: Atonement spec. Mixes themes of earlier concepts of Priests and Monks to become a viable melee fighter.