[vxa_victor]

These products look amazing but a major drawback is the lack of colors. Any chance e-ink will get color support?

[archerx]

They exist and they look cool kind of like comic books. They are expensive and the refresh rate is slower though.

https://www.waveshare.com/5.65inch-e-paper-module-f.htm

[b112]

It's all how you explain it. 4k e-ink has ~ 8M balls, and can refresh ... let's say 10x per second. giving a stunning refresh rate of 80megaballs per second.

That's an incredibly high rate!

[mdp2021]

You can use Kaleido (E-Ink EPD with RGB filter on top) - it's already available. Or, wait for cheap and fast E-Ink ACeP ("Advanced Color ePaper").

Quality, you will have to assess.