I'd also love to know if 83.1 will soon be available. I just picked up the Chained Coffin boxed set, and I absolutely love it! I'm going to be running a campaign in the Shudder Mountains and would love to have this extra material.
Please make it so!
I don't have any insider information about when "Tales from the Shudder Mountains" will be widely available, but I did want to say I extremely happy you're loving the boxed set, jodown. Every time I hear someone is setting their campaign in the Shudder Mountains, it pleases me greatly. I wasn't sure how people would embrace the idea of an pseudo-Appalachian fantasy setting in DCC, but it seems to have struck a chord with certain folks. Good luck on the campaign and have a whole lotta fun!