We had hint of it even when with the previous blurry pictures, but these clearer pictures do seem to represent a uav that's different in design to what we've seen from previous UAVs like the AR500C or other helicopter UAVs.
Even on the mock up, some features are notable including whatappears to be a chin mounted sensor that corresponds with what you'd expect from a chin mounted surface search radar.
The landing gear might also be represented by the two front wheels, though it's possible those wheels are just for moving the mock up and the real thing will have sled landing gear instead.
But the overall fuselage shape is definitely different to other designs we've seen in the past, as far as i can see.
Also, of course we can see the rotors fold which would be expected of a naval rotary UAV. The mock up seems to "lack" a tail rotor, but that should just be a reflection of the mock up's level of detail.
Key things we should be interested in is to cast eyes for better estimates of its size, and therefore can give us hints to its weight and performance (endurance, range payload).
The fact that a mock up is being aboard 075 so early would suggest it is already relatively far along with its development -- obviously developing and testing a rotary UAV like this can easily be done from prying eyes and without our direct knowledge.
Another thing to watch for is to see where/when 055 gets fit with this mock up or even when it gets tested with one. In particular, I wonder if the dimensions of this UAV may be sized to allow to to be fit in an 055's single Z-20 sized hangar, but that's something for later down the line.