In case you're wondering how the upcoming paid race changes will affect Worgen and Goblins, Wryxian briefly addressed the issue on the official World of Warcraft European forums. A player assumed the changes "will be allowed eventually, though not immediately," and Wryxian responded by saying, "that's probably how it will be. However, stay tuned and we'll update you with specific details as and when they're fully decided on and ready to share."
This course of action obviously makes the most sense and shouldn't come as a surprise to players. After all, what's the point of making new races if a player could just pay to change their high-level character into a Goblin or Worgen? The real question is how long players will have to wait until they can use the race change option to switch over to the two new races. Any thoughts?