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well publicly it will be in the fall but for us who have dev accounts it could be any time. im sure that they will add more features in 4.0 for ipad so lets wait and see:cool::D
 
They usually release major betas 2-3 months before the release. So if they are shooting for fall (lets say Sept-Oct), that would be June or July, which is not coincidentally around the time of WWDC, and probably the public release of 4.0 for iPhone and the new iPhone itself.
 
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