I agree on the point you made about the update. If it's a software update, then what exactly are the called employees doing? The only thing I could think of is demoing the new software at Apple's retail stores, and the extra hours are for training. If, however, the update is to hardware, then the call makes much more sense because customers coming to their Apple retail store will have questions about the hardware introduction/update, which the employees need to be trained to answer. In my mind, calling the employees makes the most sense when both scenarios occur at once - i.e. a combined hardware/software update. Therefore, I'm expecting both hardware and software updates next Tuesday.
