Good response. I have an XRGB mini upscaler for retro console content but that item is worth something like $300US minimum and is capped at a maximum of 1080P. Would hate to think how much an upscaler that can convert to 4k would cost hehe.

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A fact is not an opinion. All they should do is play all games 1080p60. Which is a really sad thing to say.

2K resolution should be possible for the PS4.5 depending on the game if it truly is 2x the PS4 GPU wise.

Of course they won't; my current GPU struggles with 4k gaming with low effects and keeping fps steadily in the 30's, and that card set me back 1000$ alone, and then you need the rest of the hardware to keep up.
Such a console would cost a small fortune, even rendering 4k games at 30fps with practically no effects or AA etc. would be a humongous task in itself.

I'd be happy if it played 4k blu-ray though, been looking to get a 4k player, I'm buying a 4k TV this spring/summer anyway.

QuadHD seems achievable, though. For 9th gen, anyway.

NX might depending on what it is. ps4k and xbox 1.5 aren't things but even if they were, they wouldn't play 4k games by just being new models of consoles who can barely handle 1080p.

There's no mystery about that really - RL benchmarks show that you mostly need 3xGPU to run the game at the same frame rate in 2160p compared to 1080p with same settings. If any of the consoles is to have that much juice, yeah, then they can (in theory) run at such res natively (with same settings).

My bet is (if any of MS/Sony intend to increase internal res, which I somehow doubt) 1920x2160p anamorphic - this is 12.5% more pixels than 2560x1440 with less artifacts when upscaling to 4K UHD.

But then again, I don't expect even PS5 to render in 4K native, if they intend to have similar jump in visuals as in 7th to 8th gen, and not spend a lot of GPU resources in transition from 1080 to 2160p.

If by "games" you mean demanding games, for sure... even a high end PC gaming rig barely holds most games at a good frame rate at this resolution!

However, I can't find the article again, but games like Trine 2, or other simple, but not necessarily bad looking games could run at 4K at 30FPS on the current PS4 hardware dev kit according to the Trine developper, this was mentioned in an interview before the PS4 version of Trine 2 was released a long time ago, they had a build that ran at 4K and it maintained a steady 30fps...

I agree, plus before thinking about 4K companies should focus on making 1080p/60fps the standard.