For EA 0.4 and going forward, rather than a roadmap, we are doing teases as we get closer to release. The first two teases have been released so far, with more coming each week until EA 0.4 is released!
You can see them:
https://www.reddit.com/r/bigambitions/
https://twitter.com/hovgaardgames/
Or in the BA-News section of our discord:
https://discord.gg/hovgaardgames