Apple has been shipping iOS devices with 64-bit CPUs for a while but Apple is now requiring App Store apps to include 64-bit binaries. We've been running a beta for several months for developers to create 64-bit iOS apps, so I want to share some screenshots of this feature with you. Don't forget, you can buy XE7 now and get the next release when it ships, see www.embarcadero.com/radoffer (it is highly recommended to add regular update subscription after this time limited one expires)
First, to build a 64-bit target, simply select it in the project manager and compile.
more:
http://community.embarcadero.com/index.php/blogs/entry/deploy-ios-64-bit-applications