Ps5 is coming next year. Will have microns new memory and a Vega gpu

6-6.5x og PS4 power, seems roughly correct.

I wonder how much of a RAM boost it would get. PS3 => PS4 RAM was 512MG --> 8GB so much more than 10x. But it seems like RAM increases are levelling off pperhaps with more a speed focus than a capacity focus. I would think with Scorpio having 12GB of RAM PS5 would be looking at 16 to 24GB, but not really anything more than that. Probably DDR4 RAM?

TBH, I think what can be done with PS4 og and Xb one is very impressive and I do wonder how much bigger things need to go. It's clear that games need to get more reliable in stability but the essential visuals are pretty much as good as they need to be.

The earliest I see PS5 launching is Holiday 2019.Not one moment sooner.

But depending on how well PS4 keeps on selling, its very likely that Sony will keep on pushing back the release date.

2020

I don't know about leaks, but... I don't wanna see the PS5 release until holiday 2020. The first couple years of this gen were just filled with 'remasters' and cross-gen games. It feels like the PS4 only really started moving on the games front last year.

2019 and beyond however i see a PS4 Pro Pro coming out in 2018.
PS4 is going too strong in sales for Sony to destroy it with a next gen leap. They would rather wait it out and milk the PS4 as much as they can.

Why change whats working for simply power bragging rights?

We start hearing rumors of the PS5 in 2019. February/March 2020 it would be revealed to be released November 2020.

With the scorpio and switch coming this year, we are going to have one full year (2018) of absolutely no talks about new hardware. The i 2019 the rumors will start trickling out.

I expect a lot will depend on how the Scorpio does. If it's a massive success, we'll probably start hearing murmurings about a PS5 by the end of 2018. If it does lacklustre, i think Sony will take things slow. It'd be quite a while before MS could justify launching another system (it could take another 4 years if they have to make something a big step above the Scorpio will also launching at a lower price), so Sony would be able to ride off the PS4's success for as long as it remains relevant.

Two years, they're probably interested in Raven Ridge (APUs) and HBM technology.

Did you even read my 2nd sentence? 

Well, if the PS5 releases in 2019, like I believe it will, then that would put the Pro exactly in the MIDdle of this gen.  However, that doesn't mean we aren't going to hear something about it long before it launches.  We got leaks on the PS4/XBO over a year and a half before launch.  I think we are going to get the same thing with the PS5.

I think for RAM, even 8GB of AMD's HBM2 would be enough.  That's what the Vega is launching with, I believe.  However, from a pure numbers game, they may want to at least match the Scorpio's.  Though, they may opt for 16GB.  Anything over that would be overkill.  I also think they may do what they did with the Pro.  X amount of HBMs for games, but throw in 1GB-2GBs of DDR4 just dedicated to the OS.

For the visuals, they can ALWAYS be improved.  Yes, I think we have gotten to a point with the PS4/XBO where there should no longer be the "eye's bleeding" reaction once we go back to replay those games, but there is no doubt there's plenty to be improved upon still.  Next gen, 4K will be the standard, which means textures in native 4K.  Not sure how much character models can be pushed, but environmental geometry/interaction and pop-in reduction can definitely be pushed more.

PS2 was by far the best selling home console.  That didn't stop Sony from launching the PS3 6 years after it launched.  Hell, orignally they were going to launch it just 5 years after the PS2 came out, but a snag in the PS3's development meant they had to push it back a year.  The simple fact is that while your new $399 system will sell to the more diehard crowd, your previous, now $149+ console will also sell to the more casual or budget minded gamers.