In the official document, Sony stated,
In order to further enhance the sense of immersion in games, we expect to improve not just the resolution, but the speed of games. For example, through a custom‐designed high‐speed SSD, we plan to realize game data processing speeds that are approximately 100 times faster than PS4.
The PlayStation 5 is shaping up to be a truly revolutionary device that is going to change the way games are built for quite some time with their impressive new M.2 solid-state architecture. It is set to be so revolutionary that the CEO of Epic Games, Tim Sweeney, is quoted stating the PS5 is “[G]oing to help drive future PCs“. The PlayStation 5 is still on track to release later this year, although there has been no official release date announced.