EB-5 stakeholders frequently ask USCIS to include I-526 processing under the premium processing option. USCIS revealed at the March 17, 2011 EB-5 stakeholders meeting that premium processing is unlikely to ever be available for I-526 petitions. USCIS fears that most, if not all, I-526 filings would request premium processing, thus causing the adjudications process to break down.
You can find the most up to date rules and regulations on the USCIS website. Currently, premium processing is allowed for the I-526 petition.
There is no Premium Processing available for I-526.
More recent information from USCIS implies that premium processing may soon be available for I-526 processing.