I think 2019 is more likely than 2018. 5 years would make it Sony's shortest ever generation (PS1: 6 years, PS2: 6 years, PS3: 7 years), which would be an odd decision for them to make at the same time as they decide to introduce upgrades. Doubly so when the PS4 is still selling so well. 

If they release the Neo this year (and it does well), i think we'll start seeing them work in cycles of 3 years. So PS4-2013, PS4Neo-2016, PS5-2019, PS5Neo.5-2022, etc.  

Umm, let's see... Binary compatability with existing CPU optimizations?  Leading to reduced cross-development costs?
Yes, you obviously give up the performance gains from a new CPU architecture, but there are larger potential concerns than that.
And this is exactly what was reported in Eurogamer/ other press reportage on PS4NEO up to date.

Not to say that they shouldn't/can't aim higher for that, and that IMHO, CPU architecture update is acceptable for devs to swallow.
NVM that if MS also adopts Zen with Scorpio, Sony also doing so won't actually result in more CPU arch optimizations...
In fact, with Scorpio set to adopt same memory arch as PS4 (broadly), there will be a reduction in system arch models to begin with.
In the short term that doesn't help with existing XBone/PS4.0 base, but moving forward the arch differences would just be very minor.

But re-engineering Jaguar for 14nm FinFET would make sense if they prioritized CPU optimization binary compatability.  Just saying.

Even if it's fake nothing in this seems untrue. Which makes me believe that it could be real. I mean why fake something that doesn't have some clickbaity treats in it? Seems like a lot of work for nothing.

if this is fake - props to whoever made it, you know your stuff
if this is true, which i believe it is, looks like Neo is just a 4k wannabe console, it will focus on having a resolution little lower than 4k and upscaling it, looks like i don't need to buy a Neo because i don't have a 4k TV, this is a mistake IMO, Sony should've waited till 2020 and come with a PS5 that is a massive leap and have standard 4k/60fps, best VR etc.

Pretty much this. Also, some things in there are pretty in-depth stuff. It's possible this is a fake, but considering the amount of work and knowledge this must have required, I'm leaning towards this being real.

Or For your eyes only "Mr Bond" not sure could the leak include the Bond Theme music... maybe, could add to the suspense of thinking it was real!

Lol, this seems like a fake designed to get me to download that Scribd app.

Not powerful enough, must be fake.

Probably real, given it sounds exactly like what Giant Bomb and Digital Foundry wrote. It's also old, and contains precisely no new information. Did everyone think Giant Bomb and DF just made up their sources or something?

I can't imagine this being from Sony. It's so damn poorly written with the typical amateur errors, like being cluttered with info on every row, rows stacked together, badly phrased sentences, separate lines that contain only "Etc", putting the "." before the ")" which looks really stupid, and starting every word with a capital letter lmao. And it gets worse at the end, the writer clearly being fatigued by then.

Official presentations are much more smooth.