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Engadget posted this, but neither my iPad or iPhone 4 are saying update available.
 
Notice of this is on Apple's website (no time given - just "today"). But if you try to update, iTunes doesn't show a new update available yet.
 
Great. I could have saved myself those three hours yesterday when the 4.2.1 install failed and I had to restore and resync everything! Let's see what happens tonight then....
 
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