I starting to think JH-7B doesn't exist in the sense that it is an upgraded JH-7A. I think it's a totally new bird. Clearly this plane has serpentine intakes, which makes this even more interesting. Whatever it is, is stealth, very stealth....more so than any JH-7B could have been...
I think XAC might be doing an MD, only this is a far bolder change than what the super hornet was to the hornet.
That is interesting, the first two pictures are obviously the same plane, but having single and dual seat versions... The third one has been around for a long time now, probably has to do with SAC's J-XX proposal. As for the last... It looks very very unconventional, like the SR-71 almost.
Do you wanna post the same links and pics over on CDF?