It hasn't been confirmed yet if the 6s will be out in September but if it does or even if it comes out in October, will I be able to upgrade to the newest one?
  Or will I only be able to upgrade to the iPhone 6?
  I wouldn't mind the 6 but the 6s will have a way better quality in picture and I love to take picture of my daughter.
  So can I go from the 5c to the 6s?  
  My carrier is Sprint and I have he unlimited everything plan.
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If I have an iPhone 5c, and my upgrade is in August, can I wait till September to get the iPhone 6s?