Boy Genius Report claims that their sources indicate that the iPhone's data plan will be around $34.99-$44.99 per month and feature unlimited data transfer. The text message allotment appears to be up in the air between either 2000 text messages or unlimited text.
Boy Genius Report also states that FedEx will be holding deliveries to retail stores until Friday itself, so stores will only be stocked immediately before the iPhones go on sale.
One AT&T spokesperson had claimed that they would be releasing voice and data plans prior to the Friday launch, but no information has yet been announced. A Page 2 story noted that the AT&T wireless store did go down for maintenance earlier today, but has since come back up with no obvious changes.