You have to know that with the way that Paramount has been releasing 4K titles and then releasing the 4K steelbooks later on that they will probably be releasing all of these in 4K steelbooks.
Having said that, I don't know if they would use the posters since they already did that with the UK Blu-ray steelbooks. But then maybe they would for a U.S. wave.
I already have the UK steelbooks so I wouldn't need a 4K set.