Add me to this list of people getting "We responded to your inquiry...." status change. The funny thing for me is that, just like Roj, my wife and me have been approved on Nov 2 and Nov 8 respectively, and we have already recieved welcome letter for my wife (waiting for me). Now on Nov 10, they update message saying "we responded to your inquiry..."
Here is my theory for what it is worth:
Just like we have different groups in our companies, VSC also has I-140 group, I-485 group, EAD group, AP group, and a "Response-to-inquiries" group. Looks like response-to-inquiries group got their act together, sent out a bunch of responses, and changed status message for all - irrespective of what your status is - pending, FP2, RFE, or even approved.
Way to go, VSC!!!