I got a whole bunch of mails stating "my password or email has been changed" on an email address that I'm not even using for GW2, since i dont have GW2 yet,.
so,. clearly a scam message.
Im sure others will be targetted,. it's nothing new.
Aion has pretty decent character security,. (requiring you to mouse enter a pin code before using a char or deleting it)
As does the blizz authenticator - more games should add that.