The two images show a rather thick, and very orange, case design for the phone. They were posted on a Chinese Weibo account owned by "iokeyboy", with the user saying only that the device was "not 620". The photos don't match up to anything from the current Lumia lineup of phones. One of the images also shows the virtual navigation buttons that are included in Windows Phone 8.1.
A few days ago, the FCC posted up documents showing a new device from Microsoft that could also represent proof of the Lumia 530's existence. That doesn't mean these new photos are not fake, but it certainly does seem something new is coming from the former Nokia smartphone team.
Thanks to hengxiang32401 for the tip