From USCIS: USCIS announced that it has completed data entry of all fiscal year 2016 H-1B cap-subject petitions selected in our computer-generated random process.
USCIS will now begin
returning all H-1B cap-subject petitions that were not selected. Due to
the high volume of filings, the time frame for returning these petitions
USCIS asks petitioners to not inquire about the status of
submitted cap-subject petitions until they receive a receipt notice or
an unselected petition is returned.
USCIS will issue an announcement
once all the petitions have been returned.