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My guess is that it will be released as an app when 4.0 is released to the public, and then you won't be able to download it unless you have 4.0 installed. Kinda dumb...don't understand why you would need 4.0 for the app to run, seems like a pretty basic app. Why was iBooks one of the tentpoles of 4.0? Seems like they wanted seven, but only had six.
 
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