Here's the official announcement from Blizzard:
Blizzard Entertainment is proud to announce that the portal to World of Warcraft in Europe is open!
Beyond the gates of mighty kingdoms lies a vast, unexplored world. A world of honour. A world of mystery. A world of danger. This is the World of Warcraft. Blizzard Entertainment proudly invites you to join arms with thousands of brave heroes in an online world of unlimited adventure.
Be sure to check back often, as we'll be updating the news regularly moving forward. In the meantime, we've posted some tips below to help you get started on your adventures.
At this point wow.tentonhammer.com would like to welcome all our European friends into World of Warcraft!