Thanks Natta,
I made a few consultations and i have been told that the Biometrics Notices are sent only based on the Application Support Center (ASC) 's processing time schedule. If the ASC that handles your local office and case have many pending cases, you will not be issued a Biometrics notice until they know that they have personnel and time to service you. Baltimore falls in this category. Right now, they are trying to clear the backlog so they can begin taking the 2011 AOS applicants/candidates.
However, no matter how it goes, every AOS applicant/candidate MUST get a biometrics notice within 30days of NOA. If a AOS applicant with NOA does not get it after 30days, he/she must call USCIS immediately. I was told that i should get my biometrics notice latest by November 8. I know it will come so am not worried. The fact is that a Snail will always get to it's destination, no matter how slow, i have waited over 6years for this, a few more months won't kill. Thanks for asking.When you go for your Biometrics on the 28th kindly note/observe the whole process and come back to share with us all after. You are our flagship in this area, we count on you and wish you the best.