I am getting a bit frustrated with this. I have a new iPod nano 6th generation and cannot get podcasts to work in Smart playlists so I can play them in the gym. I found a way of working around the Podcasts app on my iPad and iPhone - by deleting it.
The original question was "when will the Podcasts app support Smart Playlists?" We are now four months down the line and no closer to an answer. Some of us have provided feedback to Apple (no response from Apple), there have been ten pages of complaints on this discussion (no response from Apple), many adverse media reviews (no response from Apple).
It really does not say anything positive about an Apple app when so many people are trying to work around it, or deleting it or downloading better alternatives from non-Apple sources.
I have mentioned this on a previous post, but some years ago, there was a problem with Smart playlists. At that time, someone commented that Apple does keep an eye on the discussions and was dealing with the issue. The problem was resolved some weeks later. I had hoped that the same would happen here, but no such luck.