driver's license will work or passport.

When they first allowed character transfers I forgot my secret question. So I had to fax a similar form with a copy of my driver's license to get it back to transfer a kid's toon off my account.

To complicate matters I had just moved and updated my wow info but not gotten a new DL yet.

It is not a big deal. They are confirming it is you before they free the account. Better that then anybody asking and you losing your account.