There's a lot of confusion in regards to Siri being ported with Apple connectivity. Here's the truth.
Over the past few weeks, there has been a lot of news of Siri being ported to older devices floating around the internet. There have been numerous people who have been able to transfer the Siri files onto their older devices, however the main issue was getting Siri to connect to Apple's servers. Without Apple connectivity you're unable to utilize Siri whatsoever, making it just a useless component to your non-iPhone 4S device. A few developers such as Steven Troughton-Smith and Jack (Jackoplane) have been working constantly to hack Apple's code in order to get Apple connectivity. It's been a rigorous task as performance as well as connectivity need to work hand in hand.