ChaosOS
Legend
Original announcement source: Frontiers of Eberron
There will also be a starter adventure set in Threshold
And an update on a prior announcement
Related, if you want an easier way to look through Keith's blog, I've been maintaining an article index on the Eberron wiki.
We are proud to reveal Frontiers of Eberron: Threshold, a sourcebook that will provide everything you need to run your own campaign and adventures in the exciting Breland-Droaam border region. In addition to a full chapter focused on the town of Threshold and its denizens, this book will contain expanded locations, power groups, adventures hooks, and monsters that can be found on the frontier, along with a host of character options. It will be available both in PDF and print when it is launched on Dungeon Masters Guild in 2021!
There will also be a starter adventure set in Threshold
In September, we began development on an adventure, codenamed Hunger, that drew on the same principles—but set on the actual western frontier border between Breland and Droaam. Hunger is intended as an ideal starter campaign for new players to the setting.
And an update on a prior announcement
What about Project: Fool’s Gold? It’s still in development and on the production slate. In fact, we have significantly expanded the scope of Project: Fool’s Gold—now Project: Fool’s Platinum—and it’s scheduled for an early 2022 release.
Related, if you want an easier way to look through Keith's blog, I've been maintaining an article index on the Eberron wiki.