LoopRumors has "discovered" a letter sent to the FCC from Apple on October 12th 2006. The letter asks for numerous documents related to the iPhone to remain confidential throughout the entire process.
"...the public disclosure of the above mentioned documents might be harmful to [Apple] and would give a competitor an unfair advantage in the market."
The letter insists that details should ideally be kept confidential until at least June 15, 2007, the final day of WWDC.