I got hit with this email too, but I knew right away it was a scam. Why? Cause of all the info they asked for, I knew blizzard would never ask for it.
Second reason: I examined the email headers and saw the reply was going to actually go to wowaccountadmin@blizzacd.com (even though the 'To' box showed wowaccountadmin@blizzard.com when I hit reply to test it).

So I just ignored it.