This seems to confirm, the WL II is in PLAAF service already!
View attachment 49653
This one looks strange. It looks like both WL I and II.
WL II in the test flight photos have ventral fin, winglet, backward engine exhaust (indicating turbo-prop) and a flat chin.
This one has that engine exhaust (WL II) and flat chin (WL II). But small exhaust (WL I) just below the vertical fins albeit moved forward, but not (WL II) winglet and ventral fin.
A further thought is that this one on the show is the 1st iteration of WL II with changed fuselage and powerplant. What we saw recently is a further improvement adding ventral fin and winglet.