Want to see what Cataclysm is like before you buy it? Want to see that all the hype is about? Well you’re in luck. Blizzard has announced the availability of a 10-day free trial of World of Warcraft: Cataclysm. It is similar to the 10-day free trail of the regular game but has a little more restrictions to who can and who can’t play it.
In the trial you can undertake new quests, explore the newly reshaped environment and try out the new classes which have been added to the game. (Worgen or Goblin). You can find more information about the trial at this official Cataclysm Trial FAQ page.