While the exact nature of the talks is hush-hush, there are a few common issues that likely came up. First is simply the matter of discovering shows. Apple's current iTunes Store podcasts page (and the handful of people who run it) can only do so much to promote thousands of shows, and sharing them on social networks isn't all that easy. Podcasters also want better subscriber data, such as the number of people actively listening and how far they get into a given show. There's the not-so-small matter of revenue, too -- some podcasters would like ways to charge for access. You can listen to some music podcasts in Apple Music (such those from Above & Beyond or Armin van Buuren), but that doesn't really work for talk-oriented programming.
There's certainly pressure for Apple to do something. Spotify added podcast support last year, and Google finally brought podcasts to Android's official music app last month. In other words, you no longer have to turn to the web or an indie developer's app to listen when you can't (or simply won't) use Apple's software. The tech giant may have to rethink its strategy if it wants to remain synonymous with a media format that it (and specifically, the iPod) popularized over a decade ago.