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WWDC 2017: Apple gives Siri top billing on watchOS 4, Apple Watch
Siri is being positioned as a more proactive helper on the Apple Watch. Apple is talking about Siri like Amazon and Google talk about their assistants.

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Apple outlined its watchOS 4 -- and the aim is to provide more information via Siri, notifications, and a format that rhymes with Google Now's card approach. Simply put, Apple is riffing on Siri and the Apple Watch just like Amazon and Google talk about Alexa and Google Assistant, respectively.
WatchOS 4 is in developer preview now.
Apple Watch, tied for No. 1 in IDC's wearable device tracker for the first quarter, is getting more functionality via watchOS 4.
Read also: Apple's to-do list needs a dose of AI | CNET: WWDC 2017 live blog