Since Sony is not going to present anything at E3 2019, PlayStation CEO Jim Ryan went ahead and revealed a few more PlayStation 5 features to hype up the fans until the official announcement scheduled later this summer. The rumored custom SSD is now confirmed to be the default storage option, while the 7 nm AMD hardware will offer support for 4K @120 Hz, and there will also be a "cross-generational play" feature.
https://www.notebookcheck.net/PlayStation-CEO-reveals-PS5-support-for-4K-120-Hz-SSD-storage-and-cross-generation-play.423117.0.html
PS5 will never run 8K games natively. Please people be reasonable. Think logically. Console is made for 4K. All those other reporters are misinforming capabilities of Ps5. Only thing we will see is upscaling from 4k to 8k at best. Probably around 2028.