They may have already flown this plane. Notice that this plane is already fully painted, with the Chinese military logo on the tail.
According to the experts, all the previous test and prototype Chinese planes, they always put some primer paint instead of these fully finished paint and with no logo on the plane.
This may mean that the plane has already been trial tested and updated. These latest pictures may be the final product of the real plane.
If that is the case, then it is a good New Year present for all the anti-Chinese bashers.
The Chinese will not tell you the specification, until they have a few squadrons in service, just like the J-10 in the past. But all the necessary radars, avionics and missile weapons systems are already being tested on the newest J-10B.