lol, 4k possible on ps4 and people don't see it coming on ps5, this thread makes me sad.

It is technically possible.
However the Playstation 4 simply doesn't have the Ram, Compute or memory bandwidth to handle demanding video game titles at such a resolution.

Plus, it would be limited to only 30fps thanks to the HDMI port, which as a PC gamer... Scoff at.

I agree with that, lot of features could be added, and that's for technical reason they will use memory. But more generally speaking, and I think you understand that, there is mutual impact between memory evolution and applications evolution. Applications grow bigger, they add more feature that requires more memory, that's the technical reason for more memory... but also adding more memory create new opportunities to create applications and features not even though to date, and does not yet represent a  real technical reason.

There were a shift for example in development when we come to the point that memory quantity was big enough to make micro management not necessary  in most developments (ie outside embedded, OS, and games) and allowed to use  memory heavy consumer language like java. But applications grew so big and wide that we now have in memory database that use immense quantity of memory and some memory expiration management... For just one website I worked on, even ssd was not fast enough for data loading and we had in memory disk... application was Gb of memory with data cache... and we had in memory database for some data. The more you have memory, the less you care using a lot of it, and the more you need, that's the path that could lead to a lot more memory in PS5 , including OS/feature side. Or not, if we really reached a maximum... but I'm yet to see it after 20 years in computing.

I'd like to clarify a little more about OS and features. So far for computers, there is the OS and applications (including games), that shares the same memory. The user is expected to have enough memory or close some applications to free some memory to run the OS and the game he want. He can add memory if it's still no enough. And there is most of the time disk swap to be able to handle more memory than physical memory (trade off is that the computer become very slow). The OS memory is not a memory reserved at start, it's really at realtime what the OS is using, exactly the same way the applications use memory.

So far on console, we have a clear different paradigm. Games have a guaranteed and fixed amount of memory. OS will reserve from start the memory decided and run itself and features inside (using everything or not). So OS memory reservation can be a lot bigger than the OS memory footprint we can measure on computers.

PS5 specs you ask?

GPU? Basically 1 gen behind best PC midrange.

RAM? 24 gb ram if triple channel, 32GB if quad channel.

CPU? 12 core cpu or a equally faster meghtz 8 core, extra cores or mhz used for improved game world physics calculations maybe some quality tesselation and still able to hold a solid 60 fps.

1080p upscaled to 4k (non native/upscaled 1080p) beast machine. The masses won't believe their eyeballs. 4k UHDTVs will be as cheap as todays 1080p's more likely even cheaper.

No. Game data contains a lot of highly compressed data so you would still have loading times.

Edit: Take a look at this: http://geidav.wordpress.com/2013/04/14/making-of-turtles-all-the-way-down/

64kb demo. And believe me, you need way more ram than 64kb to get it running

Lets not forget either the data has to get from Optical Disc/Hard Drive to Ram, even when streaming from an SSD, filling up 128Gb takes forever.
Chances are mechanical storage will still have a price/capacity advantage, which usually top out at around 140Mb a second on sustained consecutive reads and when you're filling up 131,072Mb of data... Well. You do the math. (Hence why I have SSD's in Raid to take advantage of my 64Gb of Ram.)
Even worse when it comes to randomised reads too, sometimes it can drop to a fraction of it's maximum throughput.

I have big hopes that when PS5 will be launched, optical media will be dead and that flash-memory has put the final nail in the coffin for magnetical drives...

I hope by 2020 SSD like flash cards are cheap enough to be used as game cartridges. Back in the 90s cartridges out died due to their limited size but today they have more than enough.

I have big hopes that when PS5 will be launched, optical media will be dead and that flash-memory has put the final nail in the coffin for magnetical drives...

http://gamrconnect.vgchartz.com/post.php?id=6244123

I hope by 2020 SSD like flash cards are cheap enough to be used as game cartridges. Back in the 90s cartridges out died due to their limited size but today they have more than enough.

There is already optical disk format announced with up to 1TB capacity, SSD won't be used.

In my opinion storage will be flash, getting the games will be via internet.