First, what is "3D standard"? Blu ray 3D is HD resolution max. As far as commercial 3D content that's as high as it goes for video entertainment. But there is hardware out there capable of delivering higher than HD resolution for 3D. All LG passive 4K screens can input and display 3D at UHD resolution, albeit at half 4K resolution per eye, overall it's using 3840x1080/eye, that's twice the resolution what Blu ray 3D offers. One only needs the content and a 4K capable device to push the content to the display in UHD.
One could encode 8K anaglyph and view that on a 2D 8K screen in 3D, though I'm not sure what NLE one would use that supports 8K right now for 3D. There has been 8K content on YT for over 2 years now so might be possible to create 8K 3D right now and view at least in anaglyph. As Don pointed out there are HMD's that display greater than HD resolution/eye. 3D has many different specifications but we can clearly play 3D higher than HD resolution right now. The only thing that is stuck at HD is the entertainment industry for content delivery.
Another method that I've theorized and posted on here more than once is that the current spec for UHD Blu ray could support 3D. By dumping frame packing and using top/bottom half resolution which would play from a UHD player and enabled on LG passive screens top/bottom mode. This is the same idea as 1080p passive screens which were considered HD even though they were technically half resolution per eye. So that would be the same concept for UHD passive screens. The only problem is resolution higher than HD isn't compatible on all displays so it wouldn't work on current 4K 3D projectors and maybe not on some active 4K screens at least direct from the disc. So the UHD 3D disc wouldn't be universally supported.
As far as getting an official upgrade to Blu ray 3D to UHD Blu ray 3D, something needs to happen on the industry side to move things forward with new equipment and support. If they would make a new UHD 3D spec for UHD Blu ray, that would enable manufacturers to get on board. Need the likes of James Cameron to push things forward like what happened after Avatar.
One of these days I need to get a UHD player and then I will burn a UHD 3D disc. But I haven't fully taken the plunge in 4K content yet. I have to replace a 4K receiver that doesn't have HDCP 2.2 and I need a player still. And mostly I play the files off HDD which works better for me than disc anyway.
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