Will there be a "rebirth" system like in the first game?
It is more likely we'll have our characters going deeper into the caverns. That, or rebuilding the space ship to be a base of operations where characters can interact or change outfits, even having small conversations too, but we will have to wait until Chubberdy has a clearer vision on how to proceed...
As well as suffer trying to make the saves compatible with each update.
Best of luck to you!