So basically.... Saurik has released a semi restore alternative? Yay? I don't get the point unless it makes jailbreak undetectable and you are able to use things like "erase all content and settings"...
That's exactly what it does.
It removes the JB and erases everything.
This way you don't have to restore and update to the latest ios version.
How It Works:
All files on your device that have been modified or otherwise destroyed are downloaded directly from Apple. In a series of carefully calculated file migrations, all new files are moved to the user partition, and all system data is moved back to the system partition.
Up until this point, the idea is that no changes to your system have been made that are "unsafe": at any point, if Impactor fails/crashes or your device reboots, you can just run it again later. Finally, all of the staged changes to the filesystem are "committed", all user data is deleted, and iOS is told to run its "reset all content and settings".
The idea is that this "critical window" lasts only the final few seconds of a process that lasts for multiple minutes. (That said, I still highly recommend not at all "messing with" the app while it is running, and maybe if you have a lot of data this will take longer than I expect.)
When the device reboots, it will look as it did when you first turned it on; it will also no longer be "jailbroken": if you want to jailbreak it, you will need to do so using a desktop jailbreaking tool.