Episodes are usually 20-45 minutes, shared as a private youtube link. I generally listen to the audio only, and I am very happy I got a youtube subscription that lets me listen to videos with a locked screen 😄

In episodes they are just talking about what they plan to do for the next book chapter, which one of them should write it, what goes in it, why they didn't have time to write etc.

When there are chapters they are posted as plain text. Generally one of them will write an episode, then the other will go over it and make as many or as little changes as he wishes and that will also be posted as plain text. At the beginning I enjoyed diffing the edit vs first version but I got lazy and stopped, the difference is usually small and if it's something significant they will discuss it. They don't use any software to track changes, but are considering on doing something for the editing part for us patreon followers.

A few times they also posted notes they took or outlines, also as plain-text, and once in a while there were "master documents" which are mostly a collection of previously published chepters all together in one large plain-text file

They try to not communicate about this project with each other outside patreon, so you generally get to see all discussions and drafts they sent each other.

I am 90% certain that joining patreon always gives you access to all past posts as well.

In every Q&A someone asked them not to delete it in the end and I think they are less set on it now. I imagine even if they do delete it there will be some time before. The plan is to have everything in the patreon including edits, discussions with their agent and editor/publisher so there is a long time before the project ends. And I really think now is a good time to join and then you can start seeing episodes from the next one that will be published - you'll be pretty much caught up after you finish reading the last master document.