Found this on Mythic's site:

FAIRFAX, Virginia - August 13, 2009 - Mythic Entertainment, an Electronic Arts Inc. (NASDAQ: ERTS) studio, today announced that Dark Age of Camelot™: Darkness Rising™ and Labyrinth of the Minotaur™, the fourth and fifth retail expansions to the epic fantasy MMORPG Dark Age of Camelot, are now available at no charge to all subscribers. Originally launched in 2001, Dark Age of Camelot remains one of the more popular MMORPGs in the genre's history and is heralded for introducing the renowned "Realm vs. Realm™" gameplay experience.

Current subscribers will receive the expansions as part of an automatic update to their existing game client. For players that are new to Dark Age of Camelot, or for those interested in returning to the world, they can download the new 14-day free trial which now features all five retail expansions, including Darkness Rising and Labyrinth of the Minotaur. New players can download the Dark Age of Camelot 14-Day free trial here: http://www.darkageofcamelot.com/trial