They could use the Pixel Qi screen and have something that is good for reading/ really long battery life but can also do video, color when necessary.
http://pixelqi.com/blog1/2011/01/10/ces-2011-from-a-pixel-qi...
I assumed this was what the article was talking about, instead it's just suggesting a Nook Color without needing the community supported software to access all the full functionality (which would be nice, but not amazing).
ZTE have already announced such a tablet, so Amazon could just use them as OEM if they've not already got something cooking in their labs.
http://pixelqi.com/blog1/2011/02/14/zte-introduces-7%e2%80%9...