Fallout Cascadia is meant to take place several decades after the Fallout 3, Fallout: New Vegas and Fallout 4 timeline.
Fallout Cascadia, set in post-apocalyptic Seattle, aspires to offer a map roughly the size of Fallout 3, but with more quests and locations than the Far Harbor DLC just launched.
The mod team has set up a subreddit and social media feeds for others to follow as development progresses.
The team does plan to share the mod through Bethesda.net, which would make it available to consoles.