Those not yet immersed in the quests and adventures beyond the Dark Portal are invited to take advantage of the new World of Warcraft: The Burning Crusade free trial! If you are a current or previous World of Warcraft subscriber who has yet to experience the new content of The Burning Crusade, head over to the Burning Crusade free-trial page now to start your download.
During your 10-day trial period, you can explore Outland, try your hand at the new jewelcrafting profession, and create blood elf and draenei characters, which you’ll be able to keep if and when you decide to upgrade to the full version of the expansion. Please note that a full version of World of Warcraft must be present on your computer prior to installing the Burning Crusade trial. More information on the Burning Crusade free trial is available in our FAQ.
Original post by World of Warcraft Community Site