Aclaratory notes about e-ink

[quantumjelly]

This video says the Pine Note has 60Hz refresh rate:
https://www.youtube.com/watch?v=AwMKfQtSXPE

Does it mean that the screen is continuously refreshing like a LCD/OLED smartphone? Isn't e-ink supposed to stay put forever unless it's changed? I say that because backlight PWM is bad for the eyes.

Also, would like to know how good is this screen compared to Amazon Kindle Paperwhite. I want the thing closes possible to a real book.

As far as I know, it can make changes to the screen at 60Hz, but it needs multiple passes for a proper refresh.
But when the content is static, there will be no updates to the screen.
So the 60Hz is the maximum speed, but only when needed.
And don't expect to watch video in flawless 60Hz.

E-ink doesn't have a backlight, so it isn't using backlight tricks to lower the brightness.
The PineNote will have a frontlight, but that is not aimed at changing the brightness, but being able to read in the dark.

Good E-Reader says the PineNote is the Bigme B1 without colour.
One other major difference is that the BigMe B1 ships with Android and the PineNote will ship with Linux.

I just saw the BigMe B1 coloured is launching on the US and recognized the design. Is colour the only difference? Is the internal hardware the same/very similar to the point software from the pinenote could be flashed into the BigMe (display driver would need to be changed at least I guess)?

And is there an avenue for a future colour display upgrade compatible with current hardware or would that be a major hardware change/revision?