Finally a way to escape the Alliance-- You will be able to shift from one race to another across the faction boundary. According to the report of tentonhammer below:

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In reply to player requests, we're developing a new service for World of Warcraft that will allow players to change their faction from Alliance to Horde or Horde to Alliance. There's still many jobs to do and quite a lot details to iron out, but the basic idea is that players will get access to use the service to transform an existing character into a roughly equivalent character of the opposing faction on the same realm.

Players who ended up creating and leveling up characters on the opposite factions from their friends have been asking for this sort of functionality for some time, and we're glad to be getting closer to being able to deliver it. As with all of the features and services, they planed to incorporate the faction-change service to some extend that won't disrupt the gameplay experience on the realms.

Thanks for your support!