Yes. Once USCIS receives your request for premium processing, status shows that case bas neem upgraded to premium. something similar to below:
"We received your request for premium-processing of your Form I-129, Petition for a Nonimmigrant Worker, and mailed you a receipt notice."
As far as I know, USCIS has temporarily suspended premium processing until July 27. This was done on May 26th, 2015.
check this link: http://www.uscis.gov/news/alerts/uscis-temporarily-suspends-premium-processing-extension-stay-h-1b-petitions