They're celebrating by sending fans on a scavenger hunt. Runes of Magic wants you to take a look around their social networking sites: Facebook, Twitter, and Youtube, and find four gold coins that they've hidden. The coins spell out a word when put together. Find the word, head over to the contest page to enter it, and you've got a chance at winning. Ten people will be drawn from the pool of correct entries, with the first prize winner receiving a Leadtek Winfast GeForce GTX 275 graphics card. RoM t-shirts and mugs are up for grabs for nine more people.
To see the list of sites to visit, check the list on the official site, and good luck!
