Anyone know how the OTA works? Does it update packages like Debian or is there a binary diff to the new version that is downloaded and installed? Ofcourse in i

Anyone know how the OTA works? Does it update packages like Debian or is there a binary diff to the new version that is downloaded and installed? Ofcourse in iOS 4 and earlier it was the full binary image. Have they adopted the same mechanism as OSX use for updating iOS now?