I know only 4 Books are currently planned for Rejuvenated (not to mention I'm only on Book 1 at the time of writing this), though if I were to make an Book 5, it wouldn't be yet another TRTF 5 revival. In fact, it would loosely be based off that game back when it was called TRTF Remastered.

Just letting everyone in this community know so that they know not expect any Torture(d) animatronics or any other similar aspects from the TRTF 5 everyone knows in it.