Apple tells the FCC that there's more to the iPhone than the public knows and wants them to commit to a 45 day short term confidentiality that will freeze internal photos of the iPhone 4. What could Apple be holding back? Apple's FCC letter is enclosed in this report for your review.
Apple to FCC: Formal Short & Long Term Confidentiality Request
Note this specific Apple statement below: "Although Apple has begun to market the device publicly, these documents reveal technical and design information that has not been publically disclosed in such marketing and that is protected by Apple as confidential and proprietary secrets."

Also Enclosed in the FCC Document: Regulatory Label for iPhone 4

The information noted above was obtained from the FCC document BCG – E 2380A dated June 7, 2010 and just recently revealed.