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So putting (reflective) dots of Cyan and Magenta next to each other will give Red.
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No, it gives a very desaturated blue.
You can't get saturated primary colours that way.
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We'll have to wait for people to examine the display in close-up to find out for sure.
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Yes. A bit pointless to argue. However R G B filtering of reflected monochrome (filter on regular eink) is at best 1/6th brightness unless pastel filter and/or clear pixels too (which also desaturates).
This was known over 120 years ago (early colour magic lantern slides by photography) and Cyan, Yellow, Magenta layers, where the layer can be anywhere from transparent to a complementary colour (Subtractive) was a major breakthrough and why colour prints, slides and filmed movies worked.
Phosphor (CRT), Plasma, electroluminescent, LED, DLP and OLED can only be a single layer so has to use additive R G B.
LCD can be multiple layers, but it works by polarisation, so though the crystal could have a colour, the mode coloured to black, not the coloured to transparent, so all multicolour LCDs actually are monochrome clear to black with filters. An LCD that could be clear or coloured doesn't yet exist, unless that's what eink Corp have discovered.
Mirasol used diffraction. It's fast but the contrast and colour isn't great. Two Asian brands used the same electronics and panel. It may have died due to Qualcomm's infamously awkward royalty schemes.
There are colour cells that squeeze the pigment in and out of tear or comma shaped cell, but too slow and impracticable. Never any commercial product.
I've always said (since about 1980) C Y M in
layers with transition to clear would be the ultimate colour display, and suitable for posters, adverts and reading if too slow for video. Side by side C Y M would be nearly worthless. The photos of screens don't look as desaturated as that would be.