It seems that Sony would prefer more third-party game developers to showcase their upcoming titles for the PS5 on the next-gen console itself rather than relying on PC footage that will later be "optimized". Those wanting to know how much the PlayStation 5 will cost are going to have to wait longer to find out, possibly even up to August.
https://www.notebookcheck.net/Sony-wants-the-PS5-reveal-event-to-showcase-games-actually-running-on-the-next-gen-console-and-don-t-expect-to-know-the-PlayStation-5-s-price-before-August.466067.0.html