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The biggest change to Siri (other than the fact that it's launching on Mac! seems to be that Apple is opening it up to 3rd-party developers. This means that you'll be able to activate non-Apple apps and functions via voice control.
Apple is "bringing Siri intelligence to the keyboard". Which mainly manifests itself in the use of artificial intelligence and context cues to offer more suitable and relevant suggestions when typing. QuickType is pretty handy and a genuine time-saver at the moment, but remains unsophisticated. If it's half as good in iOS 9 as the demos suggested, it's about to get a lot better at predicting what you want to say.
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Click on the Apple IOS 10 below to know about other features.