[RichardHed]

One thing though - shouldn't the vapor come off the rear wings, and not off the canards?

Not really;
(From Wikepedia)Since the cores of vortices have a very low pressure, when the air is of high humidity, water vapour condenses to form cloud in the vortex cores, allowing wingtip vortices to be seen. This is most common on aircraft flying at high angles of attack, such as fighter aircraft in high g maneuvers

In a Canard airplane the higher AOA is comming from the canard as it moves quicker relative to the COG so it will vortix before the rear wings do

according to AERONAUTICAL RESEARCH LABS MELBOURNE "A canard above or coplanar with the wing delayed wing vortex breakdown"