I'll admit straight-up that I haven't looked at any of the Siri presentations, so I don't know what is and isn't possible with it, but the simple fact of the matter is that AI like it's being pitched ("reasoning", ever-learning, fast and flexible to respond to natural language input) takes an obscene amount of RAM, computing power, and persistent storage to be any good. There's not a chance that this is going to be a…
Norm: I’m not familiar with Apple’s roadmap and any delays but I can say that AI takes a lot of computing power. The Siri software needs to cache data, needs to access a big dataset at wide bandwidth and needs a big processor to crunch all of the numbers. When we originally released Siri for the iPhone 3GS, we had to perform all kinds of optimizations and shortcuts to get it to work efficiently. All I can say is that it will likely run much better on a faster phone. (Source: http://9to5mac.com/2011/10/03/co-founder-of-siri-assistant-i...)
There is a big jump in performance from 3GS to even iPhone 4, let alone iPhone 5 with possible A5 processor (dual core), 1GB RAM, iOS optimization, cloud performance, and network performance--and that's not even considering if the Sprint iPhone 5 exclusive is true which would mean the device runs on a 4G network that would make this type of interaction even more interesting if interacting with the cloud in some way.