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They just released the beta yesterday. You're not going to see the update until apple has sufficiently tested it.
 
All it does is change the signal indicators. Not worth getting excited about unless you are a fan of seeing lower reported signal strength.
 
I don't believe there's any official mention of an iOS 4 update today. It's all speculation. I wouldn't keep my iTunes open to hit that Refresh button until the 'Word' has been given by Steve & Co. themselves.
 
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wtf
 
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