Apple has today notified developers about some upcoming rules regarding App Store submission, via its developer news portal. From 1st February 2015, newly-submitted apps and updates must be built against Apple’s iOS 8 SDK. This is not particularly surprising: Apple required similar adoption of the iOS 7 SDK last year.
In addition however, Apple will also require that all apps and updates include 64-bit support from that date too. Currently, developers can choose whether to submit only 32-bit apps or universal binaries. This will no longer be an option from February. Moving all apps to 64-bit will bring big performance and memory gains for newer devices (which include A7 or A8 SoC’s) as running the 32-bit apps necessitates loading a lot of additional resources into system memory.