The Jailbreak for 5.1.2 firmware works with the Paperwhite 5.2.0 firmware.
I may have the ONLY jailbroken Paperwhite in existence! But not for long, I suspect...
You can download the Jailbreak here:
EDIT: I submitted this post to Hackaday. We may get some new members! Enjoy!
EDIT2: Let's be sure to thank NiLuJe for providing the jailbreak and simple USBnet packages that I installed here. Thanks NiLuJe! I just happened to get my new Kindle first, so I am getting most of the public attention.