A new cydia tweak- Covert will be released soon. This tweak is developed by Chpwn, the developer of many popular tweaks such as Infini tweak series- InfiniBoard, InfiniFolders, InfiniDock, ProSwitcher and GridLock. This tweak will be available for free in Cydia.

He tweeted that he just submitted a new tweak to the Bigboss repo. It will be integrated directly into MobileSafari to allow you  to privately browse web pages.