Another detail noted on these newest photos is the different placement of the star insignia on the tail, compared with that on the original aircraft (Serial 2001) that appeared last year.
Image of J-20 rear section including tail insignia, 2011
Latest image of J-20 rear section. Serial unknown.
It does make sense that further J-20 airframes will be built to add to the aircraft already being flown, and although the skeptics are out in full force crying "Photoshop!", the photos do appear legit to us, as opposed to some April Fool's joke brought to you courtesy of Adobe and someone with too much time on their hands. We await further developments.