My petition for H1B cap 2013 was filed by my employer on 2nd Apr 2012 but I haven’t received the receipt number yet. I checked with my employer they are saying that they are still waiting for receipt number for my case, since they haven’t received any rejection on my petition from USCIS.
Check this article, it has most of the info : USCIS H1B News : Delay in H1B Visa 2013 Receipt Notices Dispatch - RedBus2US