There is nothing for you to do, but be in contact with your lawyer and follow his advice.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
This is not uncommon from the investigative unit of the USCIS. You should be getting an answer soon.
Guerra Saenz, PL--Immigration Attorneys. This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice.
Stick to you lawyer. Listen.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.