请问这封回信的具体意义？

交完签证费后一直没什么消息，前几天写了邮件给NVC，回复如下，请问是发广中吗？有否其他具体含义？谢谢!
Your inquiry has been received at the National Visa Center (NVC).  All documentation necessary to complete the National Visa Center'sprocessing has been received. As soon as an interview date has beenscheduled, the designated representative of this case (applicant,petitioner, or attorney) will be notified. The US Embassy or ConsulateGeneral may require additional documentation at the time of theinterview. Sincerely,MJNational Visa CenterWritten Inquiry UnitSerco Inc., Support [email protected]