Siri is about to get much, much smarter. See also: Android M vs iOS 9 comparison.
On Monday morning at WWDC, Apple CEO Tim Cook revealed new enhancements to iOS 9, calling it "the world's most advanced mobile operating system." Among the key features are a major Siri update and deep-links in search results.
According to Craig Federighi, Apple's senior vice president of Software Engineering who led the iOS presentation and demo, Apple wants to add "intelligence throughout the user experience."
In iOS 9, Siri becomes a smarter assistant by looking at how you are using your iPhone at any given moment. For example, when users are looking at a webpage on Safari, they can create a Siri reminder by saying "remind me about this" and Siri will refer back to the webpage you were browsing.
Furthermore, Siri has become a "proactive" assistant that takes information from a users' daily habits. When users prepare to go on a run, Siri will play running music. And when getting ready to go on a drive, Siri will suggest the audio book that you've been listening to on your commute every day. The new more intelligent Siri also takes event invites you receive in Mail and automatically creates events in Calendar.
Search in iOS will also get an serious update: It will support video search from Vevo, Vimeo and YouTube and play videos directly from the search results. Search API will also allow developers to yield search results with deep-links to their app.
iOS 9 is expected this fall.