We have already seen Siri running on the iPhone 4, and now it seems that we may get a port of Siri on the iPhone 4 from the developer community is it is now legally possible to port Siri to the iPhone 4.
Apple has now released the iOS 5.0.1 update for iOS devices, and according to iPhone developer @MuscleNerd, the latest version of Apple’s iOS now makes it possible to port Siri to the iPhone 4 without any sort of piracy.
(to clarify: wide open for inspection from a Mac/PC…not wide open security wise 🙂 Can get Siri files and such without piracy)
So we can expect to see Siri landing on the iPhone 4, unofficially over the next few weeks, unless Apple decides to make it illegal again in the next release of iOS.
Source Cult of Mac