From what it says in the blog:
- Rance X will be the final game in the series
- TADA needs to be sure there weren't any plot holes left behind
- Not all characters may return; but he'll be sure to add as many of them as possible
- There may be a different gameplay
- Estimated to be release after 2 years
According to a tweet from Orion the characters on the ship are
Spoiler
Another tweet from Orion asking for reference on the character Cola, meaning the Hero may appear
Draft of Sachiko and Hiroshi-kun
Spoiler
Link to blog post: http://blog.alicesoft.com/archives/4098423.html#more