I just got a new Paperwhite, ordered just a week ago; it's a 502 serial number. Thought I'd chime in with some comments compared with the first one I got when the Paperwhite was first released (a 501 serial number).
I do notice some color tinges on both screens, but they're very faint. Neither really stops me from reading once I get into the story; they bother me more when I browse the forums and start obsessing about a "perfect" screen.
The new one has a slightly different color temperature, and the slight color "clouds" are in different places, which I notice less. It also seems a tad brighter at the same light level, with ever so slightly better contrast.
In short though, I'd say the differences aren't indicative of any newer build, that it's just a question of yield on their particular screens. It's still much better than using an external light, and I'll be sticking with the PW as it is for now.
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