As a direct effect, developers are already working on a project called “i4Siri,” which will hopefully bring the personal assistant to the last year’s iPhone in a legal way. There will still be a need for older devices to run iOS 5, but with a couple of Cydia tweaks and utilities, Siri will probably help you get things done on your iPhone 4 soon.
It is funny they would waste the time to push this to older phones, in some ways they are the king of building a cool product then creating another one right after that makes you think their old product isn’t good enough. They are bucking the trend here by caring enough for a product to go back and make it better, though I suspect their interest is to push the new voice interface culture more than caring about making your last model phone cool.
The second interesting thing is that Siri is on a phone. It may seem like nothing, but in the user interface world this is a strategic move. Siri lets people now talk to their machines. This is one more step toward trying to humanize the technology interface. Of course using the phone as the gateway makes sense since we already talk into the phone.
Previously talking to other people with the phone being the interface, now we talk to the interface. This is very smart and part of a bigger plan to get people to humanize technology and machines. It will then move the flaw of user interface from the mechanics of use to the translation and understanding of the phone. Interesting to think of the ramifications to other markets, technologies, and devices..