Its cool they are using DP for some analytics. But its not quite the holy grail Apple and its fans has been selling it as. Because any analytics campaign using DP will always eventually average out to pure noise or end up being non-anonymous.

Heres a great interview from the ms researched that invented the technique http://www.sciencefriday.com/segments/crowdsourcing-data-whi...

One of the quotes I always liked from it is "any overly accurate estimates of too many statistics is blatantly non-private"