Siri uses Nuance's servers too, so this hack simply redirects to either different servers or, more likely, an address on the same farm that isn't provisioned to Apple. Once through the front door, the processing will be identical to Siri.
Now, they just have to get Siri itself to direct to these non-Apple hosts and we can have full blown Siri on older/other devices. This has already been demonstrated by redirecting Siri on an iP4S to an alternative voice analysis server and separately with Siri being ported onto other devices. The problem with the port to other devices is that the Apple servers rejected non-iP4S ID's. So, if Siri was altered to redirect to another host, ported to another platform and some intermediary inserted on device to handle packaging and unpackaging of the requests to and from Siri/non-Siri data structures, then you have fully functional Siri on iPhone4 or iPad2. If the alternative servers are Nuance servers used by numerous other apps, then we are all set.
