There is no indication as to who their source is, but the detail about the price and the fact that a specific date is mentioned raises my hopes that this rumor will come true. My regular readers might recall that a similar rumor circulated last week which claimed that the KPW would go up for pre-order last week. That clearly clearly didn't come true, but I do find it interesting that 2 rumors are suddenly circulating right at the same time.
Even if neither rumor is true, they could be a sign that Amazon is at least interested in launching the Kindle Paperwhite in China. It might also be a sign that Amazon is cutting through the final layers of red tape that have been preventing the launch.