[dozy]

No - it just means new iOS apps must support 64-bit and be built with Xcode 6. Those same binaries/archives can also support 32-bit and older OS versions.

Similarly, today, you must build your app using at least the iOS 7 SDK and xcode 5, but that does not prevent you from supporting iOS 6 as well.

[wvenable]

Thanks for the reply. I'm not that familiar with iOS development but have a jailbroken iPhone on iOS 7.