Every episode that comes before the paid one will be free, an example being episode 1-8 is currently payment required, but when 9 is out, episode 1-8 will be free (paying for episode 1-8 will give you all future episodes)
For future content, there will be more PvE fights, (possibly) reworked fishing, and exploring with Naira!
As for animations, there are only 2 as of now: 1-7 beach date and 1-8 cellar revamp—every scene in episode 9 and after will be animated.