I really wish they would stop going on about 8k like that is something anyone gives a shit about. No one has an 8k display and even if they did although these new consoles might technically be able to output at that resolution the idea that any kid of meaningful game will be playable at that resolution with the coming gens hardware is laughable. So it's pointless, stop talking about it.
back compat games might?
360 games like Skate 3 already run at 4K60 without any hitches on Xbox One X, so I could see them maybe patching them up to 8K where possible.
and even if you don't have an 8K screen that would make for some serious AA when supersampled down to 4k.
another possibility would be games like Untitled Goose Game, so games with vers sinple graphics that would look super sharp and clean at 8k and can easily run at that resolution.
the fact is, it's good that it can do that even if it's not something we will see a lot.
just like it was great that the Xbox 360 supported 1080p even tho games struggled to run at 720p even.
because we got some games like Rayman or Perfect Dark HD that took advantage of this and looked super clean as a result.
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just like Sony should have supported 4k30 on base PS4 like they promised they would right up until launch they said they'll patch it in.
the devs of Trine said they had a patch ready for Trine 2 to run at 4k30 as soon as that patch from sony lands... and nothing happened :/