Quote from tnkgrl:
That's a standard mini-PCIe WWAN (EVDO) card - perhaps one could scope the AT commands being sent to the card, then insert the card into PC and send the same AT commands for unlimited (free) data...
Also, there's a missing SIM holder below the WWAN card - this means a GSM/UMTS version of the Kindle is planned!
It's a Novotel E725 Mini PCIe card. Despite the "E727NV" - the FCC ID of that card is the Novotel E725. In theory you'd just need the proper drivers and the modem's dialing strings/connection info from the unit itself, which may or may not be hard to find.
Also, the 'white and brown' connector you note is most likely the debugging connector, just as was on the Kindle 1.