Elsewhere, there is speculation that Apple's new 64-bit architecture could lead to new exploits that are focused on specific bugs in the kernel or software. The downside is that such a change will also break many of the existing jailbreak extensions.
"My opinion is that it will make little or no difference in terms of security, vulnerabilities and exploitation. All the difficult parts about jailbreaking will remain as difficult but not more so than before. In terms of actually packaging a jailbreak for mass consumption, it'll be a PITA to support an entirely different instruction set, but that's just a question of engineering," commented on user to the Reddit thread.
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