This Was Apple’s Most Significant WWDC Announcement. Why It’s Bad News for Google and Facebook Developers will have to disclose exactly what information their apps collect about users. 

An interesting idea but I doubt much will truly change.
In my Android → iPad conversion I came to the conclusion that Android made it easier for me to know what data I am sharing with applications; iOS makes it more clear that I am sharing data. But in practice people aren’t going to stop using their services just because of data collection. At best, we can hope users read the privacy policies, and that the platform gods police bad actors on their store fronts.