Sony is confirming that it won't let third party retailers such as Gamestop sell digital codes for full PS4 games. That means that if you want to buy digital versions of games, it has to go through the Sony playstation store. It seems like you can still buy things like DLC and season passes though. You can also still buy physical copies from retailers. The change goes into effect April 1st, 2019. That's a date where Gamestop stockholder are probably hoping that Sony is just playing an April fool's joke.
As a consumer, I just can't see how this will benefit me at all by taking away an option and then adding nothing in return.