Apple released final version of iOS 6 on 19th September and the very same day, we posted that only A4 devices can be jailbroken using previous version of Redsn0w. This is a tethered jailbreak and doesn’t have that much potential as that of Official Jailbreak
However, Adam Insull, a theme designer has uploaded a complete list of iOS 6 compatible Cydia tweaks. Some of these tweaks are working perfectly, while others don’t work at all. However, some tweaks work in between of both scenarios. I recommend you to stay away from iOS 6 and developers’ jailbreak even though you have A4 devices.
Adam Insull has uploaded the complete list of iOS 6 compatible Cydia tweaks on Google Docs. You can view them by clicking here. However, you don’t have permissions to edit the spreadsheet. Well, if you find an error, you can email the Adam Insull about that.
You can follow this guide to Jailbreak A4 devices and manually install Cydia. We are hoping that iOS 6 jailbreak will be released soon. According to news from Chpwn, he has jailbroken iPhone 5 on iOS 6 and he has also uploaded images of Cydia on iPhone 5.