I have tried to do this myself. With the newest update it supposedly will sync over playlists from iTunes, yet it doesn't seem to go into detail as to how to accomplish this. The only way I have found to sync iTunes to the podcasts app is to disable subscriptions on the podcast app and manage the subscriptions and syncing with iTunes, like we had to do in previous ios releases before the release of the podcasts apps. I think I also noticed that if you don't have podcast sync turned on in iTunes, and you have the podcasts app installed on your phone it MIGHT do a one-way sync from your iPhone to iTunes. Not 100 percent sure but it seemed like it copied everything over for me once or twice.
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