Apparently Apple has introduced a new impediment to jailbreak firmware 4.3 that its will available soon. It's called ASLR, which means "Address Space Layout Randomization, and it basically does is change some internal addresses that were previously fixed now going to have a random position in memory.
So are the userland jailbreaks the more complicated it will from now, ie, the exploits of software. Bootrom exploits as Limera1n or Shatter will still work well.
This may mean a long delay on all future new firmwares jailbreaks untethered.
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