The i140 was already approved 3 years ago and I'm waiting in my country for consular processing. This is what the NVC sent me;
'USCIS has informed the NVC that additional research is being performed on this case, and it will likely experience additional delays before being sent to NVC for processing. Unfortunately, no timeframe is available as to when this case will be sent to the NVC. As soon as this case is received at the NVC, notification and further instructions will be sent.'