There is no release date for the next PlayStation. Sony hasn't even officially named it yet, even though it's widely expected to be named "PlayStation 5" — the historic precedent is certainly there.
What we know for sure is this: The next PlayStation won't arrive this year.
But we also know that the next PlayStation has been in development for years at this point, and that Sony is sending out development models of it to game makers at an increasing clip.
Moreover, Sony simply wouldn't be speaking in this much detail about its forthcoming PlayStation console without a decent amount of confidence that it will arrive in the not-so-distant future.
Next year, 2020, is a pretty good bet — likely in the fall, just in time for the holidays.