Well this is still up for debate. I am still expecting PS5 in 2019. I dont know how SOny will ride it out untill Q4 2020. But time and sales will tell when a new generation should arrive.

I hope that the PS4 Pro supports 2.5''-HDDs with a height of 15mm, allowing 4TB-HDDs.

The 1 year advantage of this over the scorpion means it wins that race by default.
Also if the specs of the scorpio are as rumored I doubt they can keep theirs under 500$.
By the time it launches this PS4 pro will probably have dropped 50$ or so.

Its gonna be tough for MS to sell the scorpio imo.

Did they show Uncharted running on the Pro? Is it...is it 60fps!? Or are they just going for sudo-4K?

And i suspect a price drop from Sony when the Scorpion launches just to kick MS in the balls. 

Only mentioned HDR for Uncharted 4.

Scorpio will be a premium product for sure. Not sure how many people will be willing to part with that kind of money four years into a generation, no matter how big the upgrade. By the time it reaches a good price, the gen will be basically over.

For me it's kind of obvious

6 TFLOPS is to 4.2 TFLOPS what 1.84 TFLOPS is to 1.3 TFLOPS, so I don't understand why PS4 Pro is launching this year while poor Microsoft will have to wait until the next.

6 TFLOPS is not all that special if people will have had a whole year to get their eyes used to 4.2 TFLOPS. The Scorpion already is beginning to sound underwhelming, relatively speaking.

Scorpion's only chance to stand out at least a little bit is to up the specs to 8 TFLOPS and include the brand new Zen CPU from AMD.