Sony has said that they want to give these gaming experiences to those who aren’t ready to upgrade to the new generation of gaming just yet.
While these three games were designed to take advantage of PS5 and its unique next-gen features like the ultra-high-speed SSD and DualSense controller, PS4 owners will also be able to enjoy these experiences when they launch. The PS4 digital versions of launch games include a free upgrade on both PS5 consoles, while the PS4 disc versions of these games include a free upgrade on the PS5 with Ultra HD Blu-Ray disc drive.
Jim Ryan – President & CEO, Sony Interactive Entertainment
As stated in this quote, if you purchase the digital PlayStation 4 version of these titles, you’re able to upgrade it to a PlayStation 5 version for free when you’re ready, however, if you get a physical disc copy of these games, you can also get a free upgrade, but only for the standard edition console.