Marty's summary -- it's hard -- is spot on. I do, however, feel that there's room for both a quick roundup of what's happening in the #indieweb, in the way that Marty has pioneered, and for something a little more discursive. I could easily record interviews with the protagonists over Skype or similar, if they are willing. And if I weren't so geographically isolated here in Rome, I could even try to get to some Indie Web Camps or HWCs and do on the spot recordings.
My feeling is that these kinds of podcasts could help people to embrace and adopt the indieweb. There could also be a role for Q&A type things in the longer podcasts.