Apple announced that is will not allow applications without arm64 to be uploaded.
https://developer.apple.com/news/?id=10202014a
I have several questions:
P.S. It's important for me, because I use tokbox sdk, and it doesn't support arm64.
There is a slightly more detailed announcement:
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.
So for new apps, the deadline is February 1, 2015. Existing apps may still submit 32-bit-only updates, but starting June 1, 2015 even existing apps must also support 64-bit when submitting updates.
Existing apps will most likely not be removed, not even after the June 1 deadline. But they will reject submitted updates if those do not contain 64-bit support. As far as I know, Apple has not removed any existing apps yet simply because they're "outdated".