Elsewhere, it was posted that Nexus/Priority only where being handled at the C security portal (only one lane?!) and the rest had to go through the A/B portal.
Dunno if there is really only one Priority lane open, but I'm not sure that this configuration really solves anything other than having more room to queue up for everyone else.
I guess I will see for myself next week. And I used to like being based out of YVR.