THIS LINK is to an online newspaper artickle(used google translate) stating that 44 million accounts are hacked.
It is not only WoW that i affected, but several MMORPG's

It seemes they hacked account servers and retrieved passwords.

Now this is REALLY bad for those without an authenticator, we are somewhat safer....

WE WILL NEVER be totally safe, but every single bit helps.

Buy one...it's not that expensive.