I received a case status update on July 16. Basically the same email that said my case is documentarily complete and it is awaiting interview. Same email was sent to me 2 months ago too.
Excerpt from the email
"The next communication you receive from NVC will be either a notice that your appointment is scheduled, or if an appointment is not scheduled within the next 60 days, we will send a notice confirming that your case is still in line for an interview."