Apart from the new Maps app it looks like iOS 6 is really just a incremental update more than anything else. Everything that was announced for iOS 6 we have already seen in one form or another be it a Cydia tweak or a minor feature on other platforms. After going through each of the new features mentioned for iOS 6 we have been able to find all of these features available for iOS 5.
The new Siri features including the ability to take sports related queries and local searching in newer coutries has already been implemented in one way or the other with Cydia tweaks. The SiriSports tweak which is free from Cydia under ModMyi lets you make queries related to NBA, MLB and NHL from Siri. Sireet which is also free from Cydia under ModMyi lets you use Siri to tweet. Last but not least those of you in unsupported countries can install International Locations for Siri which is just $0.99 from the BigBoss repo to get local search.
Siri for the iPad is something that we have also been looking forward too. Siri has finally made its way onto the iPad with iOS 6 but only the 3rd generation iPad is supported. The jailbreak community has in fact covered this with a tweak called Spire which brings Siri to the iPad. The only problem with this is that it only works on devices running iOS 5.0.1 or earlier so it won�t support the new 3rd generation iPad.
The Do Not Disturb feature that has been added to iOS 6 is available in a Cydia Tweak called BannerDisable which is free from the BigBoss repo. This allows you to turn off all push notifications with a flip of a toggle from the native Settings app.
FullScreen for Safari is available at $1.99 from the BigBoss repo. This tweak is actually better than the official iOS 6 feature as it lets you view full screen in landscape and portrait.
The most exciting feature of iOS 6 has to be 3D maps. Apple has implemented their very own in house implementation of the Maps app which has great 3D renders of numerous cities around the world. There aren�t many apps in the App store that provide the same results but if you have an iPad then the UpNext HD maps app is a great choice. Google have announced that they will be bringing a dedicated Maps app to iOS which will bring 3D maps to everyone.
When it comes to Facebook integration the jailbreak community already have a tweak called Fusion which is $2 at the BigBoss repo that not only integrates Facebook in iOS but also MySpace and Foursquare. You can even update your status on these networks with the Siri integration that comes with Fusion.
As you can see, there are jailbreak apps available to give you all the iOS 6 features on your iOS 5 device.