The paperwork was uncovered by the Chinese blog TechWeb. As you can see from the screen shot above, the Kindle Fire HD and the Kindle Paperwhite received SRRC certification earlier this year.
The SRRC is the Chinese equivalent of the FCC here in the US, and like the US agency it regulates communication equipment in China. Gadgets cannot hit the Chinese market until they have received the necessary certification, and as you can see at least a few different Kindles have done so.
But this might not mean quite as much we hope. Look at the screen shot again and you'll see that Amazon has been getting Kindles certified in China since 2010. The bottom line shows a model number of D00901; that's the same model number as the K3. And the other 2 items on this list match up to the model numbers for last year's Kindle Fire and Kindle Touch.
BTW, one of the other interesting details is that the Paperwhite was certified in China before the original Kindle Fire. I don't know why Amazon did that but it is curious.
So really today's news is more of a sign that Amazon has long been interested in a Chinese Kindle Store, not that it will launch soon. But we already knew that Amazon has been interested in China for some time now.
This was quite clear last year when Kindle help pages leaked on the Amazon China website, and the references to warranty repair for the Paperwhite in China merely confirmed the idea. And of course when the Kindle Paperwhite shipped with support for Chinese, it made Amazon's plans blindingly clear.