I think there will be a problem if Apple name it 10.10. I never made an OSX app, but in iOS (and I believe Mac too) we often have to deal with different versions of the OS. One way to do it is by taking the version number and converting it to a real number (this is not a hack, it is encouraged by Apple engineers in developer conferences). So, if Apple release OSX 10.10, it will be converted to 10.1, bringing a lot of trouble to developers.
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