I think there will certainly be new amendments added to the bill of rights because their is never a limit to any laws that can be created, especially in our world, which is changing constantly. Ever since the bill of rights has been formed there have been many adaptations and changes made for every era the U.S has been in. You can never accurately predict what amendments would be made until they are in the process of being created. There have been amendments made on sexuality and possibly, in the future, made on immigration. I choose these because these are increasingly popular issues that are being reformed in the 21st century.
I hope that this helps you and i am working on the first one currently (hehehe) but yeah
It would be the principle of "judicial review" that guides the courts' interpretation of the civil liberties found in the Bill of Rights, since this allows the court to determine if a law is violating these rights in any way.