Ive tried to analyze latest photos through intuition and rough analysis of different drones dimensions
This item exposed under the roof is likely a downscaled mockup of wl II. Since, judging by the wideness of fuselage is lot more closer to it predecessor and CH 4. Length is much shorter, approximately comparing to the fuselage of CH 5, being shot in the plant. I believe dimension differences between real WL II and CH 5 are minimal, so this rough cross comparing gives you some insight
Object under the open sky appears to be real thing, since its appearance is much more voluminous than the thing exposed in expo hall. Maybe real drone in full size couldnt fit there