I know that the range of possibilities is broad, but some officials, such as the Chinese ambassador to France already spoke about unspecified re-education:

https://twitter.com/badiucao/status/1554946689445703680?s=20

Are there official plans, leaked or published, on what would happen to Taiwanese people, their rights, and their legal status within unified China?

Or perhaps is there an either official or 'commonly understood' standing offer such as "If you don't resist re-unification you will get to keep these rights and this status..."?