Mine suffered with the diagnostic bug when trying to set up AppleCare+ when the rMini arrived on Wednesday. Apple customer support were adamant that there was an issue with the iPad, said the only option was to replace. The 'suspect' one is being picked on Monday and the new one (out of china, in transit at the moment) is scheduled for delivery on Monday with AppleCare+ provided by Apple included.
Rather than working on the bug itself, they replace units and include AppleCare+ with it? What a strange policy!