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Is Siri specific to iPhone 4S, or will it be a part of iOS 5? It sounded like it is only a part of iPhone 4S, but it seems like it's all software. Perhaps the iPhone 4 isn't powerful enough to do the voice recognition seamlessly?

From what I hear the A5 in the 4S has some hardware components not available before - including a hardware DSP and image processor. That's what's powering Siri and the newfangled fast-camera features.

One of the live blogs I was following (don't remember which, sorry) confirmed that Siri would be iPhone 4S only.

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