I am currently in the starting phase of developing a new iOS app (for both iPhone and iPad) for a client. I'm really indecisive if I should still support iOS 4 or not. I tried to find some statistics about the adoption of iOS 5, one of the only fairly recent articles that I could find was this one. This article shows that 59,16% of all users of Bump for iPhone were using iOS 5 or later as of December 30th of last year. The (free) app will not be out for another 1.5 to 2 months, my personal guess is that the iOS 5 adoption percentage will be pretty large by then. I fully realize that there is no single answer to this question, but I would like to know what your experiences with backwards compatibility are and if you think it is worth the hassle. I would really like to use the new Storyboard functionality of Xcode and I would also really like to use ARC (although I understand that it is partially useable with iOS 4 too). The app will also use quite a bit of JSON and which is no
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