WhiteWhale is correct.
The next update, coming out this week, will be the last update to the demo (beyond bug fixes) for a while, but I'll also be pushing out the first WIP build for SubscribeStar supporters, a short while after. That version will continue to get regular updates.
As for additional free content, once I've finished adding several new major regions, my plan is to go back and add some of that content to the demo, up to a certain point. Hope this clarifies things!