Sorry for such a late reply to your question, I was doing some digging and found this website that Arc Dream appears to be using to give loose timelines for releases. (Going to add this to the stickied post)

Products that are relatively close to publication may be labeled as being in “editing,” “layout,” or “printing.” Physical rewards are also available digitally. We do not generally give release dates for physical rewards unless one is at press and we can predict its publication date with certainty.

Deep State (hardback) in development by Shane Ivey and Christopher Gunning

So it unfortunately does not list a solid date. I take this to mean they are working on it, with all the other products on that page.

There may be a lot of lore coming in the book, but it’s also very possible that March Industries is a sort-of foil to the Cowboys/DG. A large corporation with many subsidiaries each working in silos, so that any one arm has no idea what the others are up to. I’m sure you’ve absorbed all the internet has to offer at this point, but the wiki has a little info on March.

I believe if you back Dennis Detweiller’s Patreon, he offered a PDF of that deck. Not entirely sure you can go back and snag it now but I believe becoming a backer means you can see old rewards.

I’ll admit I’m about a 3-week veteran of Lemmy right now, and green as green could be, but I’d love to try modding and growing a Delta Green community if that were ok.