There are some caveats, though.Related:
Picture-in-Picture support will only be available for content provided by Apple in the Apple TV app. That includes content purchased through iTunes, TV shows and movies streamed the Apple TV+ subscription service launching later this year, and videos streamed through Apple TV Channels.
Channels, which arrived with the updated TV app in May, lets users subscribe to premium add-ons including HBO, Starz, Showtime, EPIX, Tastemade, Smithsonian Channel and others. The idea is similar to the premium subscriptions available through Amazon’s Prime Video Channels or the more recently added subscriptions offered through Roku’s streaming hub, The Roku Channel.
To be clear, that means if you subscribe to HBO through Apple’s Channels, you will be able to watch HBO in Picture-in-Picture mode when the new version of tvOS ships to the public later this fall. But if you subscribe to HBO through the HBONOW.com website and then watch via the third-party HBO NOW app, you won’t be able to use Picture-in-Picture mode.
Relatedly: the builder listens to podcasts on his phone AND the live radio at the same time.— Jim Rossignol (@jimrossignol) May 31, 2019