As this thread states, by law the design cannot be changed except by an act of Congress.
So with that said, I can see the mint producing a silver four-coin set consisting of a MS, a proof, a reverse proof, and an enhanced uncirculated.
Maybe the mint will introduce a coin with enamel as the
RCM and the Perth mints have produced recently.
I would not be surprised if the Mint will have a 4 week window of opportunity for whatever set they come up with.