Factions and organizations

There are many new faction and new organizations will be playable in WotLK.  However, there are no new playable races involved.

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Reputation grinding

A new faction system called ”Championing” will be implemented, basically, you wear the factions tabard while killing things so you gain experience and rep with that faction.  This is to allow for more flexibility when gaining faction rep.

The following is ome info from wowwiki about the nexus war,

Nexus War

When Malygos regained his senses, he quickly realized what had happened during his absence. The mortal races had manipulated magic and used it for their own personal gain. As a result, the Burning Legion had nearly been summoned again by the reckless Sin’Dorei. Confident that there is no other solution, Malygos has declared war to every spell-caster and wishes to annihilate their kind and drain all of Azeroth’s magic. However, there are groups that oppose him and fight for their own survival or for that of others.

Kirin Tor

The Kirin Tor – a group of powerful wizards – have moved their capital Dalaran to Northrend to fight off the Blue Dragonflight, along with the Undead Scourge. Being fanatic magic-users, they are directly influenced by the war Malygos has begun. Not only does he slowly drain all Azeroth’s magic, but he also intends to slay all casters. The Kirin Tor oppose him directly in his assault and fight for the fate of their world.

Blue Dragonflight

The Aspect of Magic and the leader of the Blue Dragonflight – Malygos – has started a war with the mortal races for their reckless use of magic. Using his flight, Malygos now seeks to divert Azeroth’s ley lines to his own home, the Nexus, by the use of giant constructs known as Surge needles, and send the energies out in the Twisting Nether, so no one will be able to use it anymore. He has not only ordered his fellow Blue dragons to slay the mortal spellcasters but also to take down all that would help these ‘criminals’.

Wyrmrest Accord

As the overseers of Life on Azeroth, the Red Dragonflight closely watches all wars and observes all conflicts. While they usually do not interfere they now deem it necessary to enter the front lines themselves. Malygos‘s plan, to remove all magic from Azeroth, would have disastrous consequences for the entire world. Such catastrophies would cost countless lives, much more than all those that have fallen during the Nexus War. Thus Alexstrasza – the leader of the Red Dragonflight – has called upon the Wyrmrest Accord, a union between all Dragonflights to find a way to end Malygos’s insanity and stop his reckless crusade.