For you podcast fans, this one started a few weeks ago and I'm listening, just on the 2nd episode currently.
The Castle Rock TV Podcast – A fan podcast dedicated to the Hulu TV series Castle Rock by Stephen King and JJ Abrams. Hosted by Skipper Martin and Christopher DeFilippis.
It's essentially about the new Castle Rock TV series that is coming in 2018, but in the build up to that it's going to talk about the books which have been rumoured to be part of it. First up is IT. Eps 1-3 are talking about the book, 4 is the mini series and 5 is the movie. I don't know where they are going to go afterwards.
These are heavy on the spoilers as they are literally talking about things which happen in each chapter of the book.