A paid faction change is where you pay real money to change your faction to the opposite one. For example, if you have an alliance character, you can pay blizzard to change it to a horde character Please note, there are some limitations to this. One of those limitations is, you can not change to a different class, ie.
You can not have an Alliance Human Hunter change to a Horde Undead Hunter because the Undead do not have Hunter's (at this time) When you change factions all of your racial reputation and mounts will be switched as well. Also, any other factions that start from a faction specific person, like the Knights of the Ebon Blade, The Argent Tournament, Sons of Hodir, will all be reset to Neutral and you will have to redo the quests to open up those areas again.
Paid faction and race changes will be available immediately once Cataclysm is released. Realm First achievements for leveling any class to 85 will be available in Cataclysm. However there will be no Realm First achievements associated with leveling characters of a specific race.
There will be a slight change to the way paid services work for goblins and worgen. Goblin and worgen characters wishing to change race or faction cannot be in Kezan, Lost Isles or Gilneas; they must be elsewhere to initiate the process. There are no restrictions on race/faction change to goblin or worgen.
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