Apple's revised iOS 5.0.1 update seems to have come with decrypted ramdisks, something which could make the port of Siri to other iOS devices legally possible. Before today’s firmware update, important files to get Siri working on other devices were encrypted in Apple’s file system. Decrypting them would be illegal and infringe on copyright and that is the main reason for it not being made available.
According to MuscleNerd, a prominent figure in the jailbreaking community, the release of the revised iOS 5.0.1 update means that it is now possible to extract the relevant Siri files without infringing on Apple’s copyright. It will now be interesting to see if those involved in porting Siri to other iOS devices see this as the green light and release it. We will let you know as soon as we hear anymore information.