The first image intrigues me a lot. You can see the trailing edge seems to be W shaped, while in the second one is only V shaped. I struggle to see what else could be so prominent from that angle and distance, i don't think the engine nacelle could create that effect, they can't be that tall. Maybe this thing has folding tails as well? That first image is what got me to half-jokingly liken it to a chinese Aurora, it gives the impression of large size from among others what appears to be multiple wheels main gear, but that might just be a gear door as other pointed out.The NWU paper indicates that its design is a variable-sweep-wing aircraft. I'm not going to speculate on its impact on its supposed all-aspect stealth, but it would at least partially explain why recent photos of this mysterious aircraft/CCA seems to have different wing configurations.
The paper diagram:
View attachment 157392
The recent sightings of this airframe:
View attachment 157393View attachment 157394View attachment 157395
The possibility of PS notwithstanding, it is possible that the aircraft in these images look "different" because its wings might be at different sweep angles. Compare the first and middle photographs for example. The rightmost image - assuming that it's the same aircraft - likely shows its wings at a minimum sweep while the leftmost image shows wings at their maximum sweep.
Again, this is just a semi-serious guess. And this all banks on the aircraft being real and not PSed in any way and the NWU paper being related to this airframe.
It will be disappointing if this whole thing proves to be an elaborate PS, but my gut feeling tells me it's not, i don't think the Y-9 footage is faked nor the V trailing edge aircraft is fake (except the picture Huitong deleted, that was fake as hell), but yeah can't wait for some 100% confirmation either way.