As for PS5 -- it will happen, but not soon.
I think rumors about PS5 will start circulating in 2019, not unlike how rumors Orbis (PS4's codename) started circulating in 2012.
Sony will call a PlayStation Meeting for December 3rd 2019, to both celebrate the PlayStation's 25th anniversary, and announce PS5 as a completely new console for a new generation. Mark Cerny will show us PS5 is over ten times more powerful than the original PS4 (and over 3 times more powerful than Scorpio) using a highly customized Zen+ APU, custom Navi GPU on a 2nd generation 7nm process and 64 GB HBM3, providing over 2 Terabytes/sec bandwidth. There will be a massive blowout at E3 2020 with release in November, about a week after the U.S. presidential election. PS5 will be powerful enough to combine native 4K, a huge leap in graphical fidelity and much more dynamic worlds thanks to Zen, HBM3 and much faster SSD storage technology that AMD is already combining with Vega technology on the Radeon SSG / 1TB SSD.