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I agree, Overcast as soon as possible.

Hoping for the same. I tweeted them (@OvercastFM) to request an ATV4 app. They seem to have replied to someone else that they have some other things in queue first, but hopefully they'll do one. Just discovered Overcast on iOS a couple of weeks ago and like it a lot better than Apple's app....and it allows AppleWatch control.
 
Podcasts show up when you have iTunes open on your computer and Home Share is on. But you have to be in the iTunes Home Share app.
 
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