USCIS Service Center Operations indicated on a May 15, 2013 call with AILA that as of Friday, May 10th all data entry was completed and receipt notices have been sent.
Rejection notices have also started to be sent out.
Please allow until the end of May for delivery of receipt/rejection notices.
Source of Information: “AILA InfoNet Doc. No. 13041600 (posted May. 16, 2013)”