Apple has so far overpromised and underdelivered with Siri, the built-in voice-control feature, which has been surpassed by Google Now. It improved a little with the iPhone 5 and as part of iOS 7, it will get new features, including the option to choose between a female and male voice. Will it get even better with a performance bump in the 5S? It should. But it still might take a couple more generations to turn it into a true personal digital assistant.