Since i don't have a paperwhite, and i haven't seen one in person, i should probably keep my mouth shut.
....but. I'm puzzled by all the complaints about people seeing patches of colours. I've seen the photos and videos, and see the colour people are reporting. What i don't get, is why it's considered a problem.
Artists purposefully look for and record reflected colours in everything they paint. Once you know what to look for, you see it everywhere - literally everwhere. Light itself has colour - overhead lights, the sun if you're outdoors, skylight coming in windows, all influence the colours we see around us. You never actually see a white shirt for example - there are patches that are warm colours, and others that are cool. An artist painting a white shirt needs to use pink, purple, blue, etc, to make it look like a white shirt.
In addition to the influence of light, the colour of near objects also would also reflect colour on to screens. For example the colour of the shirt you are wearing . Then as others have commented, smuged fingerprints are going to influence the light coming fom the lighted screen. If i look carefully i can see red, violet and blue, all tinting the grey of the key pad of the ipad i'm typing this on.
The puzzle part for me, is, why does it matter ? Why are people seeking a pristine pure white screen, when, nothing around us is pure white? Reflected colours are beautiful.
This is the part where i should keep quiet, and i truely don't mean to trivialize others concerns, because i can appreciate that it is distracting for someone who just wants to read. .....However, i do wonder if people just ignored it for a while, if they would stop noticing the colour, in the same way that most people look at a white shirt, and "see" white, even though, in fact, the shirt has patches of pink, blue, violet, etc. our brains just adapt, unless, like an artist, we purposefully look for the colours.