According to this article Sony is busy working on something bigger than the PS4 Pro upgrade they revealed months ago. That console was supposedly launched to upgrade the system and extend its life span a couple more years supposedly. Microsoft itself is doing its upgrade called the Scorpio and it will add more power to the X-Box One.
Anyhow the article claims the Playstation 5 is coming in late 2018. It also will offer way more power than usual .
http://screenrant.com/playstation-5-...B-P&view=lista