Analyst Michael Pachter predict that Sony not release PS5 in 2018 to compete with Microsoft Xbox Scorpio who will be released at the end of 2017.
Michael Pachter: So games will run better (on PS4 Pro and Scorpio), but they will be backward compatible- Microsoft is not replacing the Xbox One- they are upgrading it. So no, Sony will not come up with more hardware in 2018. You may get a PS5 in 2019 or maybe 2020, and an Xbox Two in 2020, and we will continue to get new consoles every three years, and their software will be compatible with the system released right before it. I think that’s going to be the pattern