Starting next year, Apple will require all new app submissions and all new updates to include support for 64-bit architectures (the A7 and A8 chips in the company's newest line of iDevices), as well as to support iOS 8 natively.
Don’t panic if your app currently doesn’t carry any of these specifications, because there’s still time to do it. Although 2015 is just around the corner, the requirement will not be fully enforced until the 1st of June, or around the time Apple will hold its annual Worldwide Developers Conference (WWDC).
The memo states, “As we announced in October, beginning on 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.”