Hi Susan! Yes we are actively developing Cycle.js. The GitHub releases tab isn't a good indication of progress because we use this custom releases page and our Twitter account is also active.
You can see from this dashboard what I'm focusing on and what Jan is focusing on.
And for our long term plans, we had a core team meeting a few weeks ago and we have clear vision for the future: github.com/cyclejs/cyclejs/wiki/Roadmap