As we announced in October, beginning February 1, 2015 new iOS apps submitted to the App Store must include 64-bit support and be built with the iOS 8 SDK. Beginning June 1, 2015 app updates will also need to follow the same requirements. To enable 64-bit in your project, we recommend using the default Xcode build setting of Standard architectures to build a single binary with both 32-bit and 64-bit code.
If you have any questions, visit the Apple Developer Forums.
Apple Developer Technical Support[/quote]