You get all updates. Yes, for Patreon/Subscribestar supporters, they mostly get cheats and gallery access, but that too will be added to the final version of the game for everybody who buys it.
The game already received all 14 monster girls that were planned, so mostly the content updates remain. This month will be the last kitchen/bath content added, and then around two months later the whole pregnancy content will be added, and the game will be officially finished.
The pregnancy system will work with a love score requirement and a certain % to impregnate the girl during the normal sex scene.
Players will be able to buy pills, which help during these scenes