Many AILA members report having received receipts on their premium processing H-1B filings, and have raised the question of how USCIS will handle premium processing filings in light of the length of time it is likely to take USCIS to conduct its random selection for the cap cases. It is highly unlikely that the selection will be completed before the 15 days for premium processing has run, and USCIS appears to understand that a premium processing filing cannot receive an advantage over a regular filing by virtue of having been filed premium. It should be noted that getting a receipt does not mean that the case has been accepted for processing. It only means that the case will be in the "lottery".
AILA has raised this with USCIS, which is reviewing the issue.