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.
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Existing apps are only affected if they want to submit feature or bug fix updates. Apple will not remove any apps currently on the store today. Luckily, complying to this rule is not particularly difficult. Adding 64-bit support to an app usually only takes a few days of development time at most, even with a big project.