I received the receipt notice yesterday. But in uscis site, the status says, "On April 16, 2013, your Alien Registration Number was changed relating to your I129, PETITION FOR A NONIMMIGRANT WORKER. Please check our website at www.uscis.gov for further updates on your case. Please wait until the end of normal processing time before calling customer service at 1-800-375-5283 for live assistance.". Can someone please let me know what does the above status mean? And also please clarify if my petition got selected in the lottery or being kept in the waiting list?