And the second most frequent question about that is: Why only the new iPhone will be entitled to benefit? Business decision?

It's really a wonder. After all, the theory that you need a powerful processor like the A5 is committed to find that the iPad 2, which has practically the same hardware as the 4S, and Siri will not have even the possibility of dictation.

But John Gruber, an expert in the world Apple, raised an interesting question. Presenting the fourth day, Apple made it clear that Siri is in beta. This means that they are still testing the functionality to see how it behaves in the real world. This is because the Siri does not process the information locally, it sends it to the Apple server, which returns the response and the commands to execute (that means without an internet connection, there Siri).
Since the difficulty in which Apple's servers went yesterday to update thousands of simultaneous users iOS, a massive use of Siri could compromise the service.