1. iOS 7 isn't available yet. Most people expect a September release, so don't get your shorts in a wad over iOS 7.
2. iOS 7 really doesn't offer anything Android doesn't already do, so why get upset over a non-existent OS that isn't all that special anyway?3
3. What does iOS 7 have to do with what your Android phone does or doesn't run?
4. To answer you question, no one outside of Sprint knows. But it's been released for the international version, and Sprint generally follows several months later. So probably about the same time OS 7 is actually available.