Sony he seems to be thinking more and more about the past, without obviously looking to the future. After PlayStation Classicin fact, it would seem that we will have another way to play the old glories of the past thanks to the backward compatibility.
A recent patent filed by Sony, in fact, reference is made to titles of the past generations (legacy software), with upscalate texture and with the addition of remastered assets. Indeed it does not refer directly to PlayStation 5, but all hopes lead to think that it is so.
This would not be an absolute novelty, since Microsoft already with Xbox One has long adopted a philosophy of compatibility with the old games that was much appreciated, which could have convinced Sony to act in the same way.
For the moment we have no further information: maybe everything will be unveiled in the first months of 2019, when according to rumors the PlayStation 5 it should be unveiled to the world.