Thought you guys might find this interesting. A poster on the Kindle subreddit has posted that the Paperwhite he/she purchased from Waterstones (a British retailer?) had the jailbreak you guys made installed. She/He infers this may be so they could put a custom Waterstones screensaver onto the Paperwhites they sell. Amazon told the customer that the Kindle is new and not refurbished. More info can be found
here