Email from Privium. Most noteworthy is this paragraph:
The waiting time is the same for all travellers within the Priority Waiting Area. This waiting time may also be longer than you are used to, but you will always pass through security check more quickly than regular travellers. Please note that the Privium card can only be used by the cardholder. It is your personal card.
Which does sound like the devaluation that we were assuming was a poor agent upthread: Privium only feeding into the Priority queue, rather than being a separate [and shorter] one. Remains to be seen whether they actually rearrange the tensa barriers and/or police it as such.
Also seems to suggest that Privium can only bypass queues once inside the building - if it's outside you're meant to wait in it. How have they been handling rail arrivals if the queue is out of the building: blocking the escalators/staircases inside...?