Here is Apple’s page for Siri, the hallmark feature of the new iPhone. The use cases for Siri look pretty great — who doesn’t want a personal assistant built into your phone like this? Siri is no Jarvis, but it sure is a step in that direction.

Note that the fine print at the bottom of this Siri feature page states that Siri will only be available on iPhone 4S. Is that a sales ploy to entice more folks to upgrade to / buy the 4S, or does Siri need that A5 chip to operate at a quality level which is up to Apple’s standards? Or is there another reason Siri is iPhone 4S only?