I’ve noticed that there are a handful of feeds for which iTunes occasional re-pulls old episodes. It seemed to happen more with my own feeds before I switched to maintaining them myself.
I’ll certainly stop by at D*C, if I have time. The interview is a good idea and even if I don’t use it, myself, I can contribute to Skepticality or elsewhere. I got some audio last year from Michael Shermer’s book tour, so there is precedence for me putting out special episodes that are a bit more oblique to the show’s usual focus.