What happens if I'm jailbroken but click software update -> install now (for iOS 6)

I have a jailbroken 4s but was thinking of upgrading to iOS 6 now that I have a jailbroken iPad that satisfies my jail breaking needs.

What happens if I go to settings -> general -> software update -> install now?

I've heard in the past that bad things happen and you do a "erase all content and settings" while jailbroken so I am wondering if the same is true of updating to iOS 6 without a computer while jailbroken?

Intell said:

Nothing will happen. Your phone will restart, the update will fail, and it'd be right back in iOS 5.1.1.

Click to expand...

Thanks Intell =)

Quick and to the point, exactly what I needed to hear.