In what may be the least surprising event of the year, Europe's World of Warcraft servers have gone down almost immediately after the expansion's launch in that region. Even Europe's Battle.net web resources appear to be down for maintenance (or are merely offline due to overwhelming load).
How long will this downtime last? We're not sure, but we will do our very best to keep you updated on European server status. European players, if you have any tips or updates on your server's status, don't be afraid to contact us via our tip line. We love to hear from you!
Update: It appears the culprit is the login/authentication server. Once you beat the login boss, the game realms themselves seem to be running just fine.