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the team that developed the ipad is different than the team that developed the iphone. they made many changes to 3.1 into 3.2 which the ipad ships with, these changes were not backwards compatible. so apple basically forked iOS between the devices.
i would guess they are taking the extra time to bring those changes back to iOS and prevent having two different development lines in the future. since it is just a software update they could release it as soon as it's ready, or drag it out until christmas.
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