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I wonder if they'll hold onto the exploit until iPhone 5?

It's an exploit in the firmware 4.3, not hardware like other devices.
It's user land, which means the next firmware breaks it (if apple fixes it).
The hardware exploit will take longer, and will most likely be held in secrecy until the iPhone 5 and maybe even next gen iPod touch.

This one should be released soon, as it will most likely be another jailbreakme.com
 
If its legit AND gets released timely, I know I'll be sending him a nice donation.

I'm curious if he found a new hole or is using a backdoor he found and never disclosed.

He said on Twitter that he had to find a new exploit to replace part of what he had been doing. So, sounds like there are still new holes to be found.
 
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