CHEER UP FAMILY! MY PETITION HAS BEEN APPROVED...
My case was transferred from the Nebraska service center to the Potomac service center on Oct. 16, 2015. Just went to check my PO BOX an hour ago and found the NOA2 approval letter. It was approved on Nov. 18, 2015, so I guess it arrived 2 or 3 days ago. Don't loose hope, I bet your cases are going to be approved soon. My case took 4 months and 4 days to get approved. Also my mom has been assigned a green card alien number.
If your case was transferred to the Potomac service center, that means your lucky, your processing times will speed up. Our immigration consultant initially told us that the hole process will take longer (aprox. 14-18 months) due to the heavy workload at the processing centers, but back then the Potomac service center wasn't open yet.
I'm so happy to know that I may soon bring my mom to live with me here in California, haven't seen her in 5 years.
Oh, another thing, don't rely on the online status check, It hasn't been updated to the latest information