Apple added new Key to the provisioning file

Question

Apple recently (In May or June 2015) added a following key on provisioning file :

<key>Platform</key>
   <array>
      <string>iOS</string>
   </array>

Does anyone know why apple add this key? Did they add it in any documentation?

Last year Apple added a new entitlement called beta-reports-active without any notice which when it was missing on the .mobileprovision apps got rejected, Does apple have a same plan? does this key related to new Xcode and iOS 9 ?

Should we update all provision files for having this key?