The hacking of Gawker websites earlier last week has prompted Blizzard to issue a security alert and emails requesting that certain users reset their Battle.net passwords. These emails, sent to your Battle.net account, request that you log into Blizzard's account management and reset your password via the provided tools.
Earlier we reported these emails as phishing attempts. This turned out to be incorrect. At the time these emails were received by members of our staff, there was no word from Blizzard on them, and such attempts at phishing out WoW account passwords are common after well-known hacking attempts.
Nonetheless, it is imperative that everyone uses an authenticator and employs good password security. Always watch what the links you go to are, and don't use the same password for multiple sites -- especially for your WoW account. If you do have an account with a Gawker website, it's recommended that you reset your Battle.net / World of Warcraft password.
Blizzard's full statement after the break.