The new iPhone 5S will be available for pre-order on September 13th and September 20th you can purchase both new iPhones.
Apple's new iPhone 5S will have an A7 chip and will be the first 64-bit phone. It comes in Silver, Gold and Gray. All apps support 64 bit apps. Its up to two times faster than the previous iPhone.
There will be a ring around the home button too. All apps will support 64 bit apps. It will have a new M7 component and motion coprocessor. Battery life will be greater than the iPhone 5.