Apple Podcasts app for watchOS 5 and WWDC Apple Podcasts session.

Apple Podcasts app for watchOS 5 
Coming this fall, listeners can stream any podcast using Siri and play their favorite podcasts on Apple Watch Series 3 using Apple Podcasts app. Episodes will sync to the Apple Podcasts app on Apple Watch, automatically. And whenever you listen to shows on other devices, Apple Watch will refresh with the next episode. 

WWDC Apple Podcasts Session 
Watch the Apple Podcasts session from WWDC 2018 to learn more about updates to the Apple Podcasts app for iOS 12, including MP3 chapter support and grouped notifications, and to see a demo of the Podcast Analytics tool. 

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