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We had heard rumors that one of the reasons Apple was planning to release iOS 4.3.1 was to fix the iPad 2 jailbreak vulnerability in iOS 4.3.
It looks like the rumors were accurate as Comex has revealed that Apple has patched the vulnerability in iPad 2 in iOS 4.3.1 released few days back.
Comex - developer of popular jailbreaking tools like Spirit and JailbreakMe had successfully jailbroken iPad 2 couple of days after it was available.
He revealed this via the following tweets: