Judging by the longer wing-looking structures (at 3) placed behind the supposed fuselage mockup of the aircraft (at 2), it seems very likely that said aircraft fuselage belongs to a KJ-600 mockup, if not that of a Chinese C-2-counterpart (though less likely IMO).
Well hello there... A new semi-clear close up of the KJ-600?
View attachment 127487
Source:
It's probably not an April fools joke because the tail is taller on the top side.
Edit: however the turboprops don't match... So maybe it as an April fools joke?