Those of you who read my Blog and use either a) a Mobile authenticator or b) the Mobile Armoury really MUST READ THIS POST AS A MATTER OF URGENCY.
As my Guildie was one of the people responsible for getting this story 'live', I have a fairly unique insight to what has happened. Because I'm not an idiot, I'm going to say nothing more than has been said by WoW Insider. Needless to say, I believe their evidence is sound, and if you use either of these devices currently I would strongly suggest you go check your account.
The EU Battle.net site is currently inaccessible. If you want to log onto your characters you'll need to do it through the game. More news, undoubtedly, as it develops.