what can we expect in later updates, if any?
If you want an in-depth plan, you can check the devlogs posted on the game page, but the quick and dirty is:
v0.045 - Sacha's story continuation (with bonus scenes for Maria and Vera)
v0.05 - Kirana's (Gnome girl) story and introduction of transformation items
v0.06 - Update/overhaul of inn management system (more game like, many guests with adult scenes)