Does your NVC case number start with GUZ or GZO? (Electronic process or regular?) I've seen on other places where people did the EP (# starts with GZO), got the Case Complete e-mail and a week later got scheduled for an interview in the next month. Ours starts with GUZ, and after the Case Complete they send the packet to the Consulate (which has to clear Chinese Customs) before the intervew will get scheduled. I called NVC and they said it could take 2+ months. I asked the consulate via e-mail and they say it could take 4+ months. The embassy website says it could take 6+ months to clear customs and get the interview scheduled. It's a black hole too, there's nobody who can tell me where it is or how much longer we need to wate. Our case complete was on 1/6, and no interview date yet.
