Seeing how it should be at least two years between Scorpio and PS5 launches, I highly doubt there would be anything credible.

No. The PS4 hasn't even been put 3 years yet, but the PS3 had 7 years before being replaced. Furthermore, the Pro and Scorpio are a pretty good indicator that Sony and Microsoft may either plan on this being a very long console cycle, or moving on from your standard console generations entirely in to iterative upgrades. Hard to say for sure what their plan is, but it is easy to predict that PS5 is years away.

PS5 will not release before 2020 I think. So rumours around 2019 or at the end of 2018.

I honestly think if Sony wanted to pull a dirty trick like that..... they could.
Why should MS be allowed and not them?

Not a real launch reveal just like MS did, say "dont buy scorpio, a year or so from now we have a 10 teraflop Playstation 5 for you".

No, not an official report, a controlled 'leak'.

Yeah that might be safer, and wont have to acknowledge anything that way either.

hell noo!
the ps4 is going in its 4th year in november,next year will be its 5th year going it.
WAAAAAAAAAAAAAAAAAY too early.

I think it's plausible Sony will reveal their next step somewhat,
although IMHO they will wait about 3 years (2 years from Scorpio) before releasing that next step.
(at which point I expect they will phase out PS4og-slim)

hile MS could follow same 3 year delay, IMHO they may very well just update after 2 years,
to better match/exceed Sony, and follow thru on "non-generation/continuous upgrade" approach.
While a 1 year delay vs PS5 could be worth it if significant tech advance is available,
matching PS5's intro with a strong console (even at higher price point) would entrench their position
as higher performance console (in top/latest model) which they seem to be going for, 
even at expense of market share, which isn't much of a loss since that is their weak point anyways.

I'm not really sure why people react so negatively to MS' move,
it seems just a natural announcement, for MS just as much as Sony.
Plenty of companies announce their product schedule ahead of time,
the CPU/GPU manufacturers whose products define 90% of hardware spec of consoles
map out of their product roadmap years in advance and largely stick to it.
What is wrong with MS informing consumers of their product offerings?

And given Sony and MS both are aware of AMD roadmap,
and both have similar intelligence re: market data,
both already have a high level of insight into each others' future offerings.
I'm not sure why keeping this info from consumers would be preferred.
I'm not sure why anybody thinks that having something better planned for future
is some dirty trick that sabotages current plans... That's how most industries work.
Accurate market knowledge, including forecasting, is how one makes informed decisions.
Being aware of MS and Sony's plans isn't prejudiced to either party.

No. Sony has nothing to fear from the Scorpio.

Early 2018 is when leaks start happening, Early 2019 revealed, launch November 2019.

PS4 codename Orbis and that it was using AMD tech was leaked march 2012, console itself was officially revealed late february 2013.

I think Scorpio will have less than a year in the minds of people as being the most powarfuh console before leaks and rumors of PS5 start taking over.