From February 2015, Apple is making all mobiles application on iOS 8 to be 64-bit architecture.
https://developer.apple.com/news/?id=10202014a
Starting February 1, 2015, new iOS apps uploaded to the App Store must include 64-bit support and be built with the iOS 8 SDK, included in Xcode 6 or later. 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.
When I upload my distribution file on App Store it give me warning that application does not support 64-bit architecture. Corona Build service needs to be updated to work with the latest update of February 1, 2015.